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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 6, No. 1, 1998, pp. 61-67
Bioline Code: cs98007
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 6, No. 1, 1998, pp. 61-67

 en Development of an integrated bean root rot control strategy for western Kenya
Otsyula, R.M.; Ajanga, S.I.; Buruchara, R.A. & Wortmann, C.S.

Abstract

Root rot severely constrains bean (Phaseolus vulgaris L.) production in parts of Western Kenya. Genetic and soil management options were evaluated for an integrated root rot management approach. Four hundred genotypes were progressively screened in the field for resistance to root not over six seasons. A sequence of problem-solving trials on cultural methods was conducted over four seasons. All trials were conducted in root rot infested fields of farmers. No resistant varieties were found in the Kenyan germplasm collection of 374 accessions. Ten resistant varieties were identified from 26 introductions which were known to be resistant to root rots in Rwanda. Farmers preferred MLB-49-89a because of its early maturity, SCAM 80-CM/5 and RWR 532 because of their high yield and seed type, and the late maturing RWR 719 as it was seen as a replacement for a previously popular cultivar which succumbed to root rots. Crop tolerance to root rots was greatly improved by improving soil fertility through application of diammonium phosphate or certain organic manures, and less so by sowing on ridges. Application of several rapidly decomposing green manures, including Tithonia diversifolia which was abundantly available in field borders, resulted in improved crop tolerance to root rot.

Keywords
Phaseolus vulgaris L., resistance, root rot, soil fertility, integrated disease management

 
 fr
Otsyula, R.M.; Ajanga, S.I.; Buruchara, R.A. & Wortmann, C.S.

Résumé

Les pourritures racinaires constituent une contrainte majeure pour la production du haricot (Phaseolus vulgaris L.) dans certaines zones de l'Ouest du Kenya. L'utilisation du materiel genetique et la gestion du sol ont ete evaluees comme une approche de lutte integree contre ces maladies racinaires. Quatre cent genotypes etaient progressivement cribles dans le champ pour resistance sur une periode de six saisons culturales. Une serie d'essais sur les methodes culturales pour le controle de ces maladies etait conduite pendant quatre saisons. Tous les essais etaient etablis dans les champs des fermiers infestes avec les pourritures racinaires. Aucune variete n'etait trouvee resistante dans la collection du germoplasme kenyan de 374 accessions. Dix varietes etaient cependant identifiees a partir de 26 varietes introduites qui etaient anterieurement connues au Rwanda comme resistantes aux pourritures racinaires. La lignee 'MLB-49-89 A' etait preferee par les paysans a cause de sa maturite precoce; 'SCAM-80-CM/5' et 'RWR 532' preferees a cause de leur haut rendement et le type de graine; tandis que 'RWR 719' vu comme un cultivar tardif etait considere comme le remplacant d'un cultivar populaire qui a succombe anterieurement suite aux pourritures racinaires. La tolerance du haricot aux pourritures racinaires etait grandement amelioree en ameliorant la fertilite du sol par l'application de di-ammonium phosphate (DAP) ou certains fumiers organiques, et elle etait aussi moins en semant sur des billons. L'application d'engrais verts se decomposant rapidement y compris Tithonia diversifolia lequel etait abondamment disponible dans les abords des champs, a resulte dans l'amelioration de la tolerance du haricot face aux pourritures racinaires.

Mots Clés
Phaseolus vulgaris L., resistance, pourriture racinaire, fertilite du sol, lutte integree contre la pourriture racinaire

 
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