STUDIES ON MAJOR INSECT PESTS AND DEFENDER FAUNA IN VARIOUS BITTER GOURD VARIETIES/LINES GROWN IN OPEN AND PROTECTED CONDITIONS
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Date
2024-02-01
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G. B. Pant University of Agriculture & Technology, Pantnagar-263145
Abstract
The present research work “STUDIES ON MAJOR INSECT PESTS AND DEFENDER FAUNA IN VARIOUS BITTER GOURD VARIETIES/LINES GROWN IN OPEN AND PROTECTED CONDITIONS” is based on population studies of insect pests and defender/natural enemies fauna in bitter gourd crop in open as well as protected conditions and their correlation with various abiotic factors. Various varieties/lines of bitter gourd have been screened against insect pests of bitter gourd and categorized as low, moderate and high tolerance levels.
During the investigation, it has been find out that population of insect pests were observed from 12th SMW to 24th SMW. The peak incidence of all insects i.e., fruit fly (20th SMW), aphid (18th SMW), jassid (15th SMW), whitefly (18th SMW), thrips (18th SMW) and semilooper (17th SMW) was witnessed from the fourth week of April to third week of May.
Population of insect pests was compared in open and protected condition. It was found that population level of all pests was higher in open condition except whitefly, which was found higher in protected/green house condition. Defenders fauna was also studied. Thirty five genotypes of bitter gourd was screened out against infestation of fruit fly (B. cucurbitae) and categorized as low, moderate and higher tolerance levels. Three cultivars were found highly tolerant against infestation of fruit fly whereas six were resistant, nineteen moderately resistant and eight were susceptible.
The current study will be helpful in developing integrated pest management strategies for bitter gourd crop in view of resistance cultivars, population management and conservation of defender fauna.
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Theses of M.Sc.