The cotton diseases [leaf roll, boll rot and bacterial blight] in Thailand
1980
Chaiwat Chandarasrivongs
Diseases are the important limiting factor for cotton production. In Thailand there were at least three potentially serious diseases of cotton - leaf roll, boll rot and bacterial blight. Leaf roll, the stunting disorder, most probably caused by a virus was the most important disease of cotton the country had ever had. The disease was widespread and extremely severe in most of cotton-growing areas. As a result, the growing areas had gradually decreased and only one-tenth left. Boll rot, a disease complex, was very serious in the past and bacterial blight was also observed to be severe. Minor diseases include preemergence and postemergence damping off of seedlings, and leaf spots caused by Colletotrichum gossypii (anthracnose) and Ramularia areola (mildew). There is the other leaf spot found causing extensive damage to the variety which was highly resistant to leaf roll last year. This variety was intended to be promoted as the next commercial variety. The unknown pathogen might be Helminthosporium gossypii or Alternaria gossypina since they were found on the diseased cotton plants. Wilts occurred sporadically and appeared to be of no practical importance in the commercial variety. The three potentially serious diseases said above have been satisfactorily controlled.
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