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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 74, No. 3, 2014, pp. 361-365
Bioline Code: cj14052
Full paper language: English
Document type: Note
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 74, No. 3, 2014, pp. 361-365

 en Palmistichus elaeisis check for this species in other resources (Hymenoptera: Eulophidae) as an indicator of toxicity of herbicides registered for corn in Brazil
de Menezes, Claubert W.G.; Soares, Marcus A.; Fonseca, Arley J.; dos Santos, José B.; da S. Camilo, Silma & Zanuncio, José C.

Abstract

The diversity of plants in agricultural systems benefits natural enemies. Herbicides are used in weed management in corn ( Zea mays check for this species in other resources L.) to reduce competition and productivity losses, but they can impact natural enemies and contaminate the environment. The objective was to evaluate toxicity of herbicides on pupae parasitoid Palmistichus elaeisis check for this species in other resources Delvare and LaSalle, 1993 (Hymenoptera: Eulophidae). The treatments were represented by the host pupae Tenebrio molitor check for this species in other resources L., 1785 (Coleoptera: Tenebrionidae) and herbicides atrazine, nicosulfuron, paraquat, and tembotrione in commercial doses compared to a control treatment with water. Pupae of T. molitor were immersed in the solution of herbicides and exposed to parasitism by six females of P. elaeisis each. The herbicides atrazine and paraquat were highly toxic and, therefore, not selective to P. elaeisis. Nicosulfuron reduced the sex ratio of P. elaeisis (0.20 ± 0.03), which may affect subsequent generations. Moreover, the herbicide tembotrione was selective to P. elaeisis, showing results comparable to the control. Floristic diversity of weeds can increase food source, habitat, shelter, breeding places and microclimates for insect parasitoids but herbicides formulations can be toxic and these products can affect P. elaeisis or its hosts by direct or indirect contact, showing the importance of selectivity studies for this natural enemy. However, the herbicide tembotrione was selective to P. elaeisis and it can be recommended for programs of sustainable management of weeds in corn crop with this parasitoid.

Keywords
Ecotoxicology; lepidopteran defoliators; parasitoids; pesticides; weed control; Zea mays

 
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