Quantification of microclimate and its relationship with insect-pests incidence in pigeonpea
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Date
2018
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CCSHAU
Abstract
Field studies on ‘Quantification of microclimate and its relationship with insect-pests
incidence in pigeonpea’ was conducted at the research area of the Department of Agricultural
Meteorology, CCS Haryana Agricultural University, Hisar during Kharif 2017. The main plot
treatments consisted of three date of sowing viz., first fortnight of May (D1), first fortnight of June (D2)
and second fortnight of June (D3) and the sub-plot treatments consisted of three varieties viz., Manak,
Paras and UPAS-120. Nine treatment combinations were tested in split plot design in three replications.
The first fortnight of May sown crop had highest thermal and radiation indices, TUE and RUE were
also highest in first fortnight of May sown crop as compared to first fortnight of June and second
fortnight of June sown crops. All growth parameters, yield and yield attributes were found highest in
first fortnight of May sown crop. Among different pigeonpea varieties, Manak consumed highest heat
units, heliothermal units and photothermal units as compared to Paras and UPAS-120 under different
growing environments. TUE, RUE, growth and yield parameters were highest in variety UPAS-120.
Population of M. vitrata larvae, H. armigera larvae, C. gibbosa nymphs and webs formed by M. vitrata
larvae was found highest in variety Manak followed by Paras and UPAS-120 whereas eggs laid by C.
gibbosa and C. gibbosa adults were highest in variety Paras followed by Manak and UPAS-120.
Among different dates of sowings, the population of all test insects was highest in crop sown on first
fortnight of May as compared to other two dates of sowings. The correlation and regression analysis
were carried out to study the relationship between major insect-pests population and microclimate of
pigeonpea varieties. Tur pod bug nymph negatively associated with temperature and M. vitrata showed
significant positive association with temperature. Relative humidity was significantly positively correlated
with M. vitrata, C. gibbosa, H. armigera. In variety Manak, 66 per cent variability in C. gibbosa
nymphs population was explained by temperature and relative humidity collectively whereas in variety
Paras and UPAS-120 it was found up to 64 and 60 per cent, respectively.
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