Les nombreuses illustrations permettent de determiner la cause des symptomes observes. Les ravageurs et les maladies sont classes suivant leur ordre d'apparition au cours du cyle de developpement du cotonnier : levee, pha0528se vegetative, phase reproductive. Les symptomes d'origine diverse sont egalement presentes : intoxications par pesticides, desequilibres nutritionnels, foudre, etc. Les sujets suivants sont brievement developpes : elements de la biologie des ravageurs et de leurs ennemis naturels, transmission des maladies, resistance varietale, relations entre le systeme de culture et les problemes phytosanitaires, et prophylaxie. La lutte chimique est evoquee tres succinctement en raison de l'evolution constante de ses composa

The paper reports on previous research undertaken on the epidemiology, etiology and loss assessment of a number of diseases in Thai cotton including, leaf roll, bacterial blight, leaf spot, wilt and damping-off. Leaf roll is the most serious disease, causing yield losses up to 63 % in some cotton varieties. Various control measures for these diseases are also reviewed including the use of chemicals, cultural practices and varietal resistance. Progress in developing integrated control measures as part of an IPC programme is also examined. The paper recommends that current and future research programs should give emphasis to developing new varieties with resistance to leaf roll disease.

The paper reports on previous research undertaken on the epidemiology, etiology and loss assessment of a number of diseases in Thai cotton including, leaf roll, bacterial blight, leaf spot, wilt and damping-off. Leaf roll is the most serious disease, causing yield losses up to 63 % in some cotton varieties. Various control measures for these diseases are also reviewed including the use of chemicals, cultural practices and varietal resistance. Progress in developing integrated control measures as part of an IPC programme is also examined. The paper recommends that current and future research programs should give emphasis to developing new varieties with resistance to leaf roll disease.

Les nombreuses illustrations permettent de determiner la cause des symptomes observes. Les ravageurs et les maladies sont classes suivant leur ordre d' apparition au cours du cyle de developpement du cotonnier : levee, phase vegetative, phase reproductive. Les symptomes d' origine diverse sont egalement presentes : intoxications par pesticides, desequilibres nutritionnels, foudre, etc. Les sujets suivants sont brievement developpes : elements de la biologie des ravageurs et de leurs ennemis naturels, transmission des maladies, resistance varietale, relations entre le systeme de culture et les problemes phytosanitaires, et prophylaxie. La lutte chimique est evoquee tres succinctement en raison de l' evolution constante de ses composantes.

Bacterial blight and boll rot, caused by Xanthomonas campestris pv. malvacearum, are serious diseases of cotton. The organism attacks leaves, stems and bolls causing leaf blight, black arm and boll rot, respectively. A total of 136 cotton lines were evaluated for their reaction to leaf blight. Of these, 57 were rated highly resistant, 38 were resistant and the rests were either susceptible or highly susceptible. Out of the 92 lines screened against black arm, 38 were found highly resistant, 27 were resistant, 22 were moderately susceptible and the rests were rated susceptible to highly susceptible. None of the 77 lines evaluated against boll rot showed resistant reaction. The correlation between leaf, stem and boll resistance to Xanthomonas campestris pv. malvacearum was determined. Using 60 cotton lines, only three lines, namely, Deltapine 16, Deltapine 61 (Australia) and Deltapine 90 showed a positive correlation, while the rests exhibited varying reactions to leaf, stem and boll infections. All lines were rated moderately susceptible to highly susceptible to boll rot. About 41 lines were rated highly resistant to both leaf and stem infections.

Not available – first paragraph follows: In the overall scheme of things in agriculture, cabbage yellows is not a particularly damaging disease. The pathogen, however — Fusarium oxysporum f. sp. conglutinans, referred to as “Foe” — belongs to a group of troublesome, very damaging, and economically important fungi that cause the Fusarium wilt diseases. The main species, F. oxysporum, has varieties (called “forma species”) that lead to heavy losses in crop plants worldwide, including cotton, tomato, banana, cucurbits, crucifers, and many ornamental crops.