RELATIVE PERFORMANCE OF DIFFERENT ENTRIES OF FIELD BEAN Dolichos lab lab (L.) AGAINST MAJOR INSECT PESTS.
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Date
2018
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
Investigation on “Relative performance of different entries of field bean Dolichos lab lab (L.) against major insect pests” was conducted at Horticulture experimental field, department of Entomology and laboratory works were conducted in department of Crop Physiology, Agricultural Biochemistry and Herbal science of Indira Gandhi krishi Vishwavidyalaya, Raipur ( C.G.) in kharif, 2017.
The study revealed that the major insect pests viz., aphids, spotted pod borer and gram pod borer were attacking in field bean genotypes. The incidence of aphid and pod borers ( spotted pod bore and gram pod borer) also started from last week of October. Further incidence was increased and recorded the peak activity of aphids/cm length around pod and pod borers (spotted pod borer and gram pod borer) larvae per plant were observed during fourth week of December, second week of December and last week of November with the population of 16.97, 2.96 and 2.47, respectively.
The results of screening the field bean genotypes against aphid showed that among the 118 genotypes, 5, 39, 48 and 26 genotypes were tolerant, moderately tolerant, least susceptible and highly susceptible, respectively.The population of aphids showed negative correlation with maximum and minimum temperatures, while negative correlation with morning and evening relative humidity and sunshine hours.
The result of screening the field bean genotypes against spotted pod borer showed that among the 118 genotypes, 14 genotypes were least preferred by insect pest and considered as tolerant. However, 102 and 2 genotypes were moderately and highly susceptible. The negative correlation was observed for pod borers ( spotted pod borer and gram pod borer) population with weather parameters.
Incidence of spotted pod borer showed positive correlation with pod length, whereas negative correlation was recorded with pod width. A strong positive correlation was observed between the pest infestation and protein content and also the pest infestation and reducing sugar content. However, negative correlation was observed between pod infestation and phenol content. also positive correlation was observed between the pest infestation and reducing sugar content, whereas, negative correlation was observed between pest infestation and phenol content.
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