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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730 EISSN: 2072-6589
Vol. 17, Num. 2, 2009, pp. 109-118
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African Crop Science Journal, Vol. 17, No. 2, 2009, pp. 109-118
Sunflower Disease and insect Pests in Pakistan: A Review
Irum Mukhtar
Institute of Mycology and Plant Pathology, University of the Punjab Lahore, Pakistan
(Received 7 March, 2009; accepted 2 September, 2009)
Code Number: cs09010
Abstract
Sun flower (Helianthus
annuus L.) is one of the important oil seed crops and potentially fit in agricultural
system and oil production sector of Pakistan. Various diseases, insects and nematodes attack damage the sunflower
crop, results a wide range of loss in production and yield. Sunflower is susceptible to diseases of various kinds.
The most serious diseases of sunflower are caused by fungi. The major diseases include rust, downy mildew,
Verticillium wilt, Sclerotinia stalk and head rot, charcoal rot, blight and leaf spot. The severity of these diseases
affects on crop yield. An account of important sunflower pests is discussed for brief understanding low yield
of sunflower crop in Pakistan.
Key Words: Sunflower, oil crop diseases, fungi, nematodes, fungal pathogen, insect's damage
RÉSUMÉ
Le tournesol (helianthus annuus L.) est une des récoltes de graines oléagineuses importantes et
potentiellement adaptée dans le système agricole et secteur de production de l'huile du Pakistan. Les diverses maladies,
les insectes et les nématodes attaquent endommage la récolte de tournesol, entrainant un éventail perte dans
la production et le rendement. Le tournesol est susceptible des maladies de diverses sortes. Les maladies les
plus sérieuses du tournesol sont provoquées par des (champignons) mycètes. Les maladies principales incluent
la rouille, rouille duveteuse, Verticillium wilt, putréfaction des tiges de sclérotinie, de charbon de bois, de rouille
et la tache de feuille. La sévérité de ces des maladies affecte le rendement de récolte. Un inventaire des
parasites importants de tournesol est discuté pour une brève compréhension du rendement bas de la récolte de
tournesol au Pakistan.
Mots Clés: Tournesol, maladies des plantes oléagineuses, champignons, nématodes, microbes
pathogènes fongiques, la destruction de l'insecte
INTRODUCTION
The Sunflower (Helianthus
annuus L.) is one of the most important oil crops globally and is
grown on over 22 million hectares worldwide, with
a production of 26 million tonnes (Shirshikar,
2005; Skoric et al., 2007). Sunflower
(H. annuus) belongs to the family Asteraceae. Helianthus annuus var. macrocarpus, the giant sunflower,
is cultivated for edible seed (Khan et al., 2007). Sunflower is an important oil seed crop. As an
oil seed crop, sunflower was introduced in Pakistan during 1960 with the object of bridging the
gap between production and consumption of edible oil in the country (Burney
et al., 1990).
Pakistan is deficit in vegetable oil
production. We meet 28 percent of our requirements
through indigenous sources. The balance of 72% is
met through imports. The imported edible oil's budget is growing into billion of dollars;
becoming a big drain on our foreign exchange
reserves. Edible oil and oilseeds import cost of US$
1045 million during 2006-07. The edible oil
requirement stood at 3.094 million tonnes in the same year.
This included 2.237 million tonnes from
imported sources (oil and oilseeds). Local
production remained at 0.857 million tonnes. Demand of
edible oil is increasing at a rate of 5.4 percent
annually. At this rate, our annual requirement would
be 4.168 million tonnes after five years and if
local production is not increased rapidly annual
import bill will raise to 2.593 billion US$
(Anonymus, 2008).
The agro-climatic condition of Pakistan is
not conductive in general for palm oil
cultivation. Sunflower and Soyabean were found to have
the potential to raise the productivity of edible oil
in Pakistan (Nasir, 2003). Over the years,
sunflower has become an important crop for both
farmers and consumers in Pakistan. Sunflower is a
crop that fits well in the local cropping system and
is considered the most important cash crop in all parts of the country. In all parts of Pakistan,
the crop is grown in two seasons, spring and
summer. The crop duration is such that it can be sandwiched between two cotton, rice or
potato crops. It is a high yielding oil crop which
gives high return to the farmers (Shah et
al., 2005). So it has a great potential to make the country
self-sufficient in edible oil. It is needed to improve
the yield potential of sunflower varieties/hybrids
to increase sunflower production of the country (Haq et al., 2006).
Commercially available sunflower
varieties contain from 39 to 49% oil in the seed. The
oil accounts for 80% of the value of the sunflower crop, as contrasted with soybean which
derives most of its value from the meal. Sunflower oil
is generally considered a premium oil because of its light colour, high level of unsaturated
fatty acids and lack of linolenic acid, bland flavor
and high smoke points. The primary fatty acids in
the oil are oleic and linoleic (typically 90% unsaturated fatty acids), with the
remainder consisting of palmitic and stearic saturated
fatty acids.
Low yield of sunflower may be attributed
to several reasons such as occasional adverse climatic conditions, poor agronomic methods
of cultivation, non-availability of improved seed
and prevalence of diseases and damage caused by pests. Sunflower is attacked by many
diseases, which reduce the yield and quality
significantly under optimal conditions (Mirza and Beg, 1983).
More than 90 sunflower diseases have
been reported world wide (Bai et al., 1985). Sunflower plants are attacked by a number of
infection microorganisms mostly Fungi, Bacteria
and Nematodes which reduces yield and quality (Ara et al., 1996; Bhutta et al., 1997; Amin and
Youssef, 1997). The severity of losses induced by
plant pathogens is often related to the crop
growth stage at the time of disease onset and intensification. Occasionally, when the
disease begins at an advanced stage of crop development, crop yield is not impaired
(Zadoks, 1985).
The most serious diseases of sunflower
are caused by fungi. The major diseases include
rust, downy mildew, Verticillium wilt, Sclerotinia
stalk and head rot, phoma black stem, charcoal rot
and leaf spot. The severity of these diseases
affects on crop yield. There is a dire need to
raise production through disease control.
The present work is a review of
Sunflower disease research findings from Pakistan and
a brief understanding of diseases.
CHARCOAL ROT
Sunflower plants suffer from charcoal rot
disease caused by Macrophomina phaseolina( Jalaluddin, 2008). M. phaseolina has a wide host range and is responsible for causing losses
on more than 500 cultivated and wild plant
species (Khan, 2007). Charcoal rot of sunflower
was reported for the first time from Faislalabad
(Mirza, 1984) and later from other areas of Punja
(Sindh and NWFP provinces) as a threat to
sunflower (Mirza and Beg, 1983; Steven et
al., 1987). Macrophomina phaseolina survives as
free sclerotia in the soil or embedded in the host
crop and in dry soil for long period (Sinclair,
1982).
Ahmad (1988) reviewed research on
different sunflower rots in Pakistan. Six rots
including, charcoal rot, head rot, stalk rot, collar rot,
black rot and bacterial rot are known to exist.
Among these, charcoal is considered the most
prevalent. Ataga and Akueshi (1986) observed that M. phaseolina grew well on the seeds,
increased the free fatty acid, oil content and
caused discoloration of the oil. However, the relation
of sunflower borne pathogen and oil quantity and quality is not well understood. M. phaseolina is reported as the most destructive on
sunflower crop and major in yield in Pakistan (Mirza and
Beg, 1983; Mirza, 1984).
Symptoms. Early symptoms of the disease
are not visible, but sudden wilting of plants,
usually after pollination, is the most common
symptom. The diseased plants mature early and show brown to dark brown spots appear on stem
from which the disease gets the name `charcoal rot',
if the affected stem is split, black microsclerotia
are found in the pith. The plants become weak, dry and show light gray or ashy black
discoloration of stems. Poorly filled heads can be seen
and drying of stalks occurs, which also become normally discolored. Pith disintegrates
and vascular fibers appear shredded, covered with small bodies of disease causing fungi.
SCLEROTINIA STALK WILT AND HEAD ROT
Sclerotinia sclerotiorum is causative agent
of stalk and head rot in sunflower (Mirza and
Yasmin, 1984; Bhutta et al., 1995). This disease is
found throughout the world where sunflower is
grown. Sclerotinia sclerotiorum seedling, stalk and
head rots are hazard to sunflower all over the
world (Mesterhazy and Gulya, 1988). Sunflower diseases especially head rot followed by
charcoal rot are the serious threat to sunflower growers
in Pakistan (Mehdi and Mehdi, 1988; Khan et
al., 1999). So far no commercial sunflower
cultivar has been reported with resistance against M. phaseolina (Gul et al., 1989; Ahmed and
Burney, 1990; Hafeez and Ahmad, 1997; Khan, 2007).
Symptoms. Diseases appear in different
phases as root rot, stem rot, and head rot.
Water-soaked lesions appear on the taproot and fibrous
roots. The disease is also characterised by sudden wilting of leaves. Gray to brown lesions
appears at the base or other parts of the stem. The
plant wilts and dries up. Stems shred in to
vascular strands and become straw colored on drying.
In head rot, white mycelium growth of the fungus
is observed. White, fluffy mycelium of the pathogen can also be found inside or
outside infected tissues under moist conditions.
Sclerotia can survive in soil for many years, with or without crop residue. Such heads fall off and have
no seeds.
ALTERNARIA BLIGHT
Alternaria blight is one of the most
prevalent and serious diseases of sunflower and
could become epiphytotic (Mirza and Beg, 1983).
Many workers have reported Alternaria blight as one
of the serious disease in Pakistan (Ghafoor and Khan, 1974; Mirza and Ahmad 1982; Mirza
and Yasmin, 1983; Ahmad 1988; Bhutta et
al., 1993). Alternaria spp. was first described as a
sunflower pathogen (Sackston, 1978) and since then it
has been found in most parts of the world and destructive in some years. A. helianthi, the leaf, stem and head spotting pathogen, appears to
be the most threatening (Sackston, 1978).
Alternaria leaf spots have been reported to reduce the
seed and oil yield by 27 to 80 percent and 17 to
33 percent respectively (Reddy and Gupta, 1977; Balasubrahmanyam and Kolte, 1980). The
damage due to the disease is the number of seed per
head, followed by yield. It also affects the quality
of seeds by adversely affecting the seed
germination vigor of the seedlings.In Pakistan, these
diseases are also reported; as major limiting factors
in sunflower production (Mirza and Beg, 1983; Blinda et al., 1993; Bhutta et al., 1995).
Symptoms. The symptoms first appear in
the form of dark-brown to black, circular to oval-shaped spots on the lower leaves. The spots
are surrounded by necrotic chlorotic zones with
gray white necrotic center marked with concentric rings. The disease spreads gradually to the
middle and upper leaves. Late in the season,
elongated spots are found on petioles, stems, and
ray-florets resulting in leaf blight and sometimes
cause rotting of stem and heads. High humidity
favours the pathogens.
SEPTORIA LEAF SPOTS
Septoria leaf blight of sunflower, caused
by Septoria helianthi, is widely
distributed throughout the world with reports from
Europe, Asia, Africa, Australia, North and South
America (Frandsen, 1948; Kubenkova, 1980; Liu and
Lu, 1988; Petrov and Arsenijevic, 1996; Rashid and Platford, 1992 and 1994; Yang et
al., 1988).Septoria leaf spot on sunflower was first observed
by Henry and Gilbert (1924) and subsequently reported from many countries of the
world including India and from Pakistan with a
different climatic zone (Siddique and Yasmeen, 1982).
The pathogen has also been reported in Pakistan on sunflower (Akhtar and Mirza, 1988). S. helianthi has been recorded in various parts of the
world causing reduction in yield. Its 30-60%
incidence also has been reported from Pakistan
(Mirza, 1984).
Symptoms. On average, 5-8% plants show
leaf spot symptoms. Plants show small irregular
spots on lower leaves which gradually spread to
upper leaves. The spots mostly start from the
margins of leaves, coalesce resulting in the
development of yellow to dark brown irregular blotches.
Small angular to more or less circular or
sometimes diamond shaped, brown to dark brown
spots develop on upper leaf surface and lighter
gray brown on lower leaf surface. In these spots
many small pycnidia are develop on both surfaces
of leaves under moist conditions. A spot coalesce and leaves wither and dry first on lower
and gradually spread to upper leaves (Hamid and Jalaluddin, 2007).
RHIZOPUS HEAD ROT
Three species of Rhizopus cause head rot of sunflower (Helianthus
annuus) around the world: R. oryzae Went & Prinsen
Geerligs (synanamorphs R. nodosus Namyslowski and
R. arrhizus A. Fischer), R. microsporus Tiegh.,
and R. stolonifer (Ehrenb.:Fr.) Vuill. (synanamorph
R. nigricans Ehrenb.). Head feeding by larvae of several insect species is correlated with
the severity of Rhizopus head rot (Klisiewicz,
1979; Rogers et al., 1978). M.
phaseolina (charcoal rot) and Rhizopus spp. (head rot) were reported
as most destructive on sunflower crop in Pakistan (Mirza and Beg, 1983).
Symptoms.The head turns brown and
become soft, gray mycelial growth develop later.
Brown irregular water soaked spots appears at back
of head. These spots enlarge, turn brown, and become soft and pulpy. Heads clearly look abnormal. Wet weather following
flowering favors disease development, particularly if
the heads are damaged by hail, birds, or insects. There is no control, although varieties
with upright heads are more frequently infected
than varieties with bending heads.
VERTICILLIUM WILT
Verticillium wilt is caused by a persistent
soilborne and seedborne fungus, Verticillium
dahliae that remains in the soil for several years.
Verticillium wilt may be a serious disease on lighter soils
with a history of sunflower cropping. Infection
occurs when soilborne microsclerotia germinate and penetrate sunflower roots. The fungus
grows into the plant's vascular system, producing numerous microsclerotia that spread
throughout the entire vascular system and all parts of
the plant.
Symptoms. Verticillium wilt symptoms can be
on individual plants or groups of plants in a
field. Disease symptoms first appear on older
plants, generally after the six-leaf
stage. Prominent yellow, inter-veinal patches appear on
leaves, which are gradually enlarged and coalesce,
while leaf centers turn brown and necrotic, having mottled appearance. Affected leaves
rapidly become dry and die. Symptoms usually are
not observed until flowering but under severe conditions they may occur as early as the
six-leaf stage. Severely diseased plants may
contain masses of tiny black fruiting bodies (microsclerotia) inside the stalk.
These microsclerotia look like finely ground
pepper. When highly magnified, the microsclerotia
are irregular to club-shaped (0.1 mm or less in
length). Affected stems have black streaky patches
on them, and roots are also affected. Plants show stunting, small flower heads and destruction
of root system.
RUST
Sunflower rust, incited by Puccinia
helianthi Schwein., is a major disease in
sunflower (Helianthus annuus L.) growing
areas of the world (Quresh and Jan, 1993). Rust disease has
been reported in Pakistan; however, information on incidence and distribution of disease in
various agro-ecological zones is not comprehensive.
Oil yield losses in sunflower caused by rust
infection are greatly influenced by the growth stage of
the plant when infection occurred and by the intensity of infection (Siddiqui and Brown, 1997).
Symptoms. Small, chestnut brown or orange
to black powdery, scattered pustules appears on lower leaves first. But can spread to all
leaves and even living parts of the head. The
leaves become dry pre-maturely, affecting yield and
seed quality. The leaves may turn yellow but rarely
fall on the plants. The first pycnial and aecial infections usually occur on volunteer
seedlings, growing among the debris of the previous
crop. The incolum from the affected crop is spread
by wind.
DOWNY MILDEW
Downy mildew disease of sunflower has
been considered as a potentially destructive
disease. This disease had spread to all sunflower
growing countries mainly through seeds (Viranyi,
1990). Downy mildew is a serious obstacle in
sunflower cultivation due to its systemic nature of
infection. Sunflower downy mildew caused by Plasmopara halstedii, is a one of major disease of
sunflower (Rahim et al., 2002). Plasmopara halstedii (Farl.) Berl and de Toni is the most destructive
one. P. halstedii is a soil-borne pathogen, its
oospores serving as primary inoculum for young
sunflower seedlings. The disease has been
distributed mainly by seed to all sunflower growing
countries (Leppik, 1966; Viranyi, 1990). Powdery mildew
has also been reported in Pakistan (Mirza, 1984).
Symptoms. P. halstedii may induce disease symptoms of various kinds depending on age
of tissue, level of inoculum, environmental conditions and cultivar reaction. The
main symptoms include damping-off of seedlings; systemic infection of stem leaves and
flower/seed head, which is the most typical and
important; cotyledon-limited systemic infection (Ljubich and
Gulya, 1988); localised below-ground infection of roots and/or hypocotyl; localised
leaf infections causing angular leaf spotting. The downy mildew fungus attacks sunflowers as both seedlings and mature plants, causing
white cottony growths in the young plants, and
large, clublike roots and stunted growth in the
older ones.
Symptoms. Typical symptoms occur in
seedling stage. Infested seedlings die, but those that
and carrying systemic downy mildew infection are stunted and the leaves show characteristic
green and chlorotic mottling along the main veins
and over the lamella. Local foliar lession
symptoms are characterised by small angular
greenish yellow spots on leaves .In the affected
plants flower heads are erect. Under moist conditions,
a white downy growth composed of sporangiophores and sporangia of the
fungus appears on the lower leaf surface
corresponding to chlorotic areas above.
SEED BORNE DISEASES
Sunflower seeds, which are consumed as
raw, roasted or salted, contain 32 to 45% edible
oil, which is a rich source of polyunsaturated
fatty acid. Several seed-borne fungi including
species of Alternaria, Aspergillus, Cladosporium, Curvularia, Drechslera, Fusarium and Penicillium have been reported from sunflower seeds (Reddy, 1989; Kaur et al., 1990; Shahnaz and Ghaffar, 1991). Moreover, seed-borne
fungi decrease protein, carbohydrate, cholesterol contents, iodine values and increase
acid quantity (Singh and Prasad, 1986; Sexana and Karan, 1991; Ahmad et al., 1994). Low quality with reduced and discolored oil contents of
sunflower seeds are reported to be caused by species
of Rhizopus (Zad, 1979; Singh and Prasad,
1977), Damages of seeds, such as seed death,
seedling and plant abnormalities or decreased seed
vigor caused by seed-borne pathogens are not
always recognised by users.
Shahnaz and Ghaffar (1991) reported
5 Fusarium spp., with predominant occurrence
of F. moniliforme and F. solani. But, Fusarium oxysporum and F. solani which were isolated from seeds are aggressive pathogens of sunflower
as compared to F. moniliforme and F.
pallidoroseum (Bhutta et al., 1997). Acremonium fusidioides, Arthrobotrys oligospora, Aspergillus
ochraceus, Bipolaris bisepta, Cephaliophora tropica, Chaetomium spinosum, Cladobotryum
varium, Cladosporium cladosporioides, Emericella nidulans, Gonatobotrys simplex,
Humicola grisea, Memnoniella echinata, Mucor
mucedo, Myrothecium verrucaria, Phialophora verrucosa and Syncephalastrum racemosum were found to be new seed-borne fungal
species on sunflower in Pakistan (Sharfun-Naharet
al., 2005).
OTHER FUNGAL DISEASES
Several other pathogens also attack
the sunflower crop. Phomopsis macdonaldii capable of causing extensive internal stalk decay
and premature opening of sunflower it seed yield losses arc slight (Carson, 1991). In Pakistan,
its incidence was reported in Punjab (Masirevic el al., 1987). Phomopsis helianlhi, causal agent
of brown spot and stem canker of sunflower cused 20 percent loss on hybrids in Iran
(Madjidieh, 1988). In Pakistan Phoma bracea is only
reported in Punjab area in traces (Masirevic el
al., 1987). Root rot caused by Rhizoctonia and Macrophomina species, Cercospora leaf
spots caused by Cercospora helianthi are
also sometimes less as well more important fungal
diseases. Phialophora asteris f.sp.
helianthi has also been reported as wilting agent at
flowering stage of sunflower (Mirza and Ahmad, 1999).
ROOT KNOT NEMATODE
In Pakistan, the root-knot nematode problem
is more damaging than in developed countries, because the country has tropical and
sub-tropical regions, where the climate is suitable
for nematode activity throughout the year (Khan
and Ahmad, 2000).
Amongst root knot nematode,
(Meloidogyne incognita) has proved to be a threat to
sunflower crop. Root knot disease of sunflower is
becoming one of the most serious calamities for
the successful cultivation of sunflower crop. On account of alarming loses, it requires
immediate and due attention to minimise its
predation (Rehman et al., 2006). According to an
estimate root knot nematode cause 16.44% yield losses
in infected sunflower plants followed by
yellowing, stunting and killing of plants(Rehman et al., 2006).
Meloidogyne incognita is the most
widely distributed species as it was found in all the
34 districts of Punjab (Khan and Ahmad, 2000).
In the other parts of Pakistan, such as
Karachi and Sindh too, M. incognita has also been
found to dominate over the other species (Ahmad and
Saeed, 1981).
INSECTS
The major hazards to sunflower seed
production are insects. These insect pests serve as
vector for virus and other diseases. Leaf curling, chlorosis and premature senescence of plants
can be due to severe infestation on sunflower by Empoasca abrupta (Rogers, 1981). Sunflower acts as a host of several which ravage it both
in the field as well as in the warehouses and
inflict severe losses.
The pests ravaging this crop
include Cutworms (Agrotis spp.), Green stink
bug (Nezara viridula nnaeus), American bollworm
( He/icoverpa (Heliothis) armigera), Cotton aphid (Aphis gossypii Glov), Potato aphid (lacrosiphum euphorbiae Thos), and Cabbage semi-looper (Plusia orichalcea (Fabricius)). Others include ifflower caterpillar (Perigea capensis G), Head caterpillar
(Tathmopoda theoris Mayr), Melon fly (Dacus
Cucurbitae Coq.), whitefly (Bemisia tabaci Genadius), Yellow flower thrips (ankliniella sulphurea S.), several species of army worms, grasshoppers
and termites, Brown bruchid (Caryedon gonaga bricius), Sawtoothed beetle (Oryzaephilus spp.) (Aslam, 2000). Whiteflies, loopers and
Jassids have also been recorded on different local genotypes of sunflower in Pakistan. (Rafiullah et al., 1998).
The insect pests found in
sunflower (cultivated and wild) also include Agrotis
spp (Cut worm), Odontotermes obesusi (White
ants), Agapanthia dahlii (Stem borer), and Melanagromyza spp. (Stem girdler), Aphis gossypii (Cottoii aphid). Others include Agnus convolvoli (Horn worm), Empoasca
spp., Su/eima helianthana (Sunflower bud moth), Helicoverpa spp. (bull worm) Spodoptera litura (Tobacco caterpillar),
and Plusia ohchalcea (Cabbage semilooper). Also included are Homoeosoma electellum (Sunflower moth), Atezara viridula (Green stink bug) Diacrisia obliquata (Hairy caterpillar), Myllocerus b/andus(CoXXon green weevii), Zygogramma exclamationis (Sunflower beetle) and Smicronyx spp,(Sunflower
seed weevil) (Aslam et al., 2000; Ashfaq and
Aslam, 2001). Butt (1989) discussed that major
insect pests found on sunflower genotypes are Amrasca devastans, Thrips tabaci,
Bemisia tabaci, Tingid bug and Eutetranychus spp. Kakakhel et al. (2000) reported that the
insect pests attack on sunflower are Bemisia
tabaci, Empoasca spp., Thysanoplusia
orichalcea, Diacretia obliqua, Nezara viridula,
Helicoverpa armigera and Nysius inconspicuus . ). Sattar et al. (1984) also reported the insect pests
of sunflower as whitefly, Bemisia tabaci, aphids Aphis gossypii, jassids (Amrasca
devastans), bud moth (Heliothis
armigera) and surface grass hopper (Chrotogonus spp. ).
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