The insect pests and diseases of blackgram continue to pose a serious threat to the plant growth and yield. The sucking pests in blackgram are economically most important that not only cause the direct damage by feeding but also by transmission of different viral diseases. Sucking pest complex in blackgram include an array of sucking pests out of which thrips, whitefly and aphids are the most important. The leaf curl disease caused by GBNV in blackgram is transmitted through thrips. A study was conducted involving 25 blackgram genotypes to screen them against leaf curl disease. The results obtained from the study indicated that the leaf curl disease incidence (%) and thrips population (Number plant -1 ) varied significantly among the genotypes. Late sowing of the crop coincided with higher temperatures, lower relative humidity and high vector population resulting in higher leaf curl disease incidence. The correlation studies indicated that the leaf curl disease incidence (%) was negatively associated with the mean and morning relative humidity (%) and positively associated with mean, maximum and minimum temperatures.
A field experiment was conducted during late kharif 1999 to study the influence of nitrogen and potassium on the incidence of sheath rot and crop yield in rice revealed that the disease incidence increased with increase in nitrogen level from 0 to 300 kg ha while decreased with increased potassium level from 0 to 140 kg ha', The number of infected tillers and grains were more with 300 kg of nitrogen and 0 kg of potassium and were less in plants treated with higher levels of K (140 kg ha¹) irrespective of nitrogen level. Application of 300 Kg N and 140 Kg K ha recorded significantly higher grain yield of 3909 kg ha compared to 0 kg N and 0 Kg K ha (2900 kg ha"). Higher grain yield of 3623 kg ha was recorded in CV NLR 30491 compared to NLR 33633 (3288 kg ha¹).
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