study on partial resistance of some commerical potato cultivars to bacterial wilt agent under greenhouse and microplot conditioons in Jiroft
2004
Azadvar, Mahdi | Aein, Ahmad | Amiri, Masood | Rahimian, Heshmatolla
Bacterial wilt of vegetable crops caused by Ralstonia solanacearum is very damaging in tropical and subtropical humid countries. In Jirof and kahnouj regions, this pathogen is one of the most limiting factors for potato production. As for other vascular bacterial plant diseases, chemicals are not effective and sanitation measures are difficult to apply. The worldwide control strategy consist of breeding wilt- resistance cultivars. During 2001- 2002, Farmers field of potato in Jiroft were surveyved for bacterial wilt percentage in autumn and winter cultivations. In addition in microplat and greenhouse experiments, 19 commerical potato cultivars were evaluated for resistance to R. solanacearum (race 3/ biovar 2-A). plants were inoculated on the basis of winstead and kelman’s root and stem inoculation method with GD1 strain, isolated from wilted potato in Jiroft. Disease reaction of cultivars were rated on the basis of disease severity index(DSI) and the “MSTATC” soft ware package was used for data analaysis. The results indicated that singnificant differences in DSI were observed among the root inoculated potato cultivars. N0 cultivars were immune or resistant, but Santana, Aula and Marfona showed more tolerance. Diamont and Primir were the most susceptible cultivars in this study.
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