EGG PARASITISM OF COLORADO POTATO BEETLE, Leptinotarsa decemlineata (Say) BY Edovum puttleri Grissell (Hymenoptera:Eulophidae) INFESTING TOMATO AND EGGPLANT IN MARYLAND

N K KRISHNA KUMAR

Abstract


Crop loss caused by chilli thrips, Scirtothrips dorsalis Hood, was estimated in field plantings of chilli and sweet pepper, Capsicum annuum L. Quantitative yield loss was maximum in chilli pepper in contrast to qualitative yield loss caused due to scarring by thrips on sweet pepper. More than 90% yield reduction was observed on chilli pepper compared to 11- 32% in sweet pepper because of thrips infestation. Qualitative yield loss of 88-92% was observed in sweet pepper. Highly significant negative correlation between marketable yield (fruits free of scarring damage) and rating for thrips damage on different days after transplanting was observed in sweet pepper. Total yield was not significantly correlated with damage ratings on different days after transplanting in sweet pepper but was correlated in chilli pepper. Retention of dry sepals after fertilization on developing fruits influenced qualitative yield loss in sweet pepper.


Keywords


Chilli pepper;crop loss;sweet pepper;Scirtothrips dorsalis

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