Meleti prosvolis vambakiou apo adromykosi. Rolos poikilion kai kalliergitikon paragonton. Prosdiorismos posotikon kai poiotikon apoleion.
1985
Galanopoulou S. | Galanopoulos N.
The percentage of Verticillium wilt infestation (foliar symptoms) on cotton plants grown in a highly infested field at Sindos during 1976-79 was 10%-26% in July and 28%-59% in August. The degree (severity) of infestation was less differentiated and not always proportional to the percentage of infested plants which means that the product of these two coefficients is a more reliable disease criterion. The aggravation of infected plants symptoms was also independent of wilt percentage and greater for the mild degrees of infection. The varieties responded differently to the wilt infestation. Early varieties were generally more susceptible to the early and late varieties to the late infestation. Similar reaction was also displayed between early and late sowing. Varietal yield was affected, but not entirely, by disease resistance. The increased plant population in double rows and the sowing on beds restricted infestation, but the yield was increased only by the first factor. Early sowing, in spite of greater infestation and disease losses, yielded more than the late one. Yield loss was proved proportional to the: percentage, degree and duration of infestation. Cotton plants with infestation degrees in July 1, 2, 3, 4 yielded respectively 51.3%, 40.6%, 20.9% and 4.0% of healthy plants while those infected in August yielded respectively 88.7%, 68.6%, 45.9% and 26.6%. The yield loss per area, due to the infestation of July and August was 10% and 12% respectively. Mean boll weight was decreased by 0.39 g. The reduction was proportional to the infestation degree and generally greater due to late infestation. Among the technological characters only Micronaire index was lowered by 0.20 units.
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