Pest management: diseases of soybeans in Thailand
Udom Pupipat | Kitti Choonhawong | Praphant Osathaphand
A survey of winged bean diseases in Bangkok, Rayong, Khon Kaen, Kalasin, Surin and Nakornrajchasima Provinces indicated that diseases were caused by fungi, one by virus, one by mycoplasma and by nematode. Leaf spot was caused by Pseudocercospora psophocarpi (Yen) Deighton, collar rot by Sclerotium rolfsii Sacc. and Rhizoctonia sp., wilt by Fusarium sp., anthracnose by Collectotrichum lindemuthianum (Sacc and Magn.) Bri and Cav., flower blight by Choanephora cucurbitarum (Beck and Bae) Thaxt. and pod rot by Diplodia sp. A disease caused by root knot nematode Melodogyne javanica (Treub) Chitwood and the other caused by virus and mucoplasma developing mosaic and witches's broom symptoms, respectively were noticed. A study of the cost-effectiveness of spraying fungicides showed that Bayleton at a concentration of 125 ppm (two or three applications) gave the highest returns. The second from Bayleton (two or three applications) was Manzate-D at 2,000 ppm (five applications). Evaluation of six fungicides when used in combination by pairs in the laboratory for testing Phakopsora pachyrhizi Syd. showed that Manzate-D at a concentration of 1,000 ppm with Bayleton at 50 ppm, both with and without Agridex sticker 0.2 percent prevented uredospore germination. The use of Agridex alone or mixed other fungicides reduced the germination percentage of uredospore
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Bibliographic information
This bibliographic record has been provided by Thai National AGRIS Centre, Kasetsart University
