Screening of Chickpea Germplasm Against Helicoverpa armigera (Hubner) and Estimation of Losses Due to Insect Pests
Loading...
Date
2015
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
MPUAT, Udaipur
Abstract
The present investigation on, “Screening of chickpea germplasm against
Helicoverpa armigera (Hubner) and estimation of losses due to insect pests” was
carried out at the Instructional Farm, Rajasthan College of Agriculture, Udaipur
during rabi, 2014-15. Common chickpea varieties of zone IV (a) were evaluated for
their preference by the pod borer and the losses due to insect pests were estimated.
Among the six varieties screened and expressed as per 4-m row, Pratap Chana was
most preferred by the pod borer, as it harboured the maximum numbers of eggs
(15.85), larvae (12.02) and damaged pods (41.44). The variety GNG 1581 was least
preferred for egg laying (4.79); and had lowest larval population (3.80); RSG 888 had
lowest numbers of damaged pods (4.19). On seed yield basis per 12 m2 plot, variety
RSG 902 had significantly more yield (2.96 kg) than GNG 1581 (1.75 kg) and RSG
888 (1.78 kg); however, Pratap Chana with a yield of 2.39 kg/plot was statistically at
par with RSG 902 and was thus highly tolerant. The larval parasitoid, C. chlorideae
was active from 15th December, 2014 to 26th January, 2015; but, the maximum
parasitization varied on different varieties. The abundance of the parasitoid, C.
chlorideae was significantly more on chickpea variety Pratap Chana, but effective
parasitization was more on variety GNG 663. The relative parasitization was
considerably less in different varieties as compared to that on Pratap Chana ranging
from 30 to 54 per cent less. Correlation between pod borer and its parasitoid was
significant (+ 0.83) for GNG 1581. The prevailing abiotic factors of the environment
did not evince any significant effect on the pod borer and larval parasitoid population.
The loss estimation due to insect pests on chickpea showed that plant stand was 30
per cent more when the crop was treated and kept pest-free; whereas, the mean larvae
per plant was 6 times more and the mean number of damaged pods per plant were 7.7
times more when untreated. On the basis of yield, an avoidable loss of 26.57 per cent
was recorded due to H. armigera infestation.
Description
Screening of Chickpea Germplasm Against Helicoverpa armigera (Hubner) and Estimation of Losses Due to Insect Pests
Keywords
null
Citation
Mahavar and Swaminathan, 2015