Influence of insecticides on growth and development of Bemisia tabaci (Gennadius) infesting cotton
Loading...
![Thumbnail Image](assets/images/Item.jpg)
Date
2020
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Punjab Agricultural University, Ludhiana
Abstract
The study on ‘Influence of insecticides on growth and development of Bemisia tabaci
(Gennadius) infesting cotton’ was undertaken on 50 days old plants of Bt cotton cultivar,
RCH 773 under screen house conditions at Entomological Research Farm, Department of
Entomology, PAU, Ludhiana during crop season 2018 and 2019. Effect of repeated
application of different insecticides (flonicamid 50 WG @ 100 and 200 g/ha, pyriproxifen 10
EC @ 625 and 1250 ml/ha, spiromesifen 22.9 SC @ 250 and 500 ml/ha, fipronil 5 SC @
1000 and 2000 ml/ha, ethion 50 EC @ 1000 and 2000 ml/ha and bifenthrin 10 EC @ 450 and
900 ml/ha) on the biology and oviposition preference of B. tabaci; biochemical constituents
of cotton leaf and relative expression of vit and jhe gene in B. tabaci were recorded. The
results revealed that fecundity of whitefly was significantly lower in spiromesifen 22.9 SC @
500 ml/ha (18.93 and 29.22 eggs/female) and higher in bifenthrin 10 EC @ 900 ml/ha (43.47
and 62.00 eggs/female) and fipronil 5 SC @ 2000 ml/ha (38.99 and 47.04 eggs/female) over
untreated control (32.49 and 40.64 eggs/female) during 2018 and 2019, respectively.
Pyriproxifen and spiromesifen significantly prolonged the incubation period, total nymphal
duration, pupal period and total developmental period and had minimum egg, nymphal and
immature stages’ survival of whitefly. Similarly, pyriproxifen and spiromesifen recorded
minimum adult longevity, nymphal growth index, growth index of immature stages and
resurgence ratio of B. tabaci. Bifenthrin neither prolonged the duration of various
developmental stages nor affected nymphal growth index of B. tabaci. However, sex ratio
(female:male) of B. tabaci was increased in fipronil (2.18 and 2.03) and bifenthrin (2.06 and
2.00) over untreated control (1.62 and 1.41) during 2018 and 2019, respectively. Spiromesifen
(23.89 and 40.33 eggs/leaf) treated plants were least preferred for oviposition by B. tabaci
whereas bifenthrin and fipronil (128.78, 250.56, and 123.33, 219.33 eggs/leaf, resp.) treated
plants were most preferred over untreated control (81.00 and 120.33 eggs/leaf) during 2018
and 2019, respectively. The results obtained from biochemical studies revealed that bifenthrin
and fipronil treated leaves showed increase in total soluble sugar, reducing sugar, total soluble
protein, free amino acid and crude protein content of cotton leaf and decrease in starch
content over untreated control. Bifenthrin also decreased the total phenol and tannin content
of cotton leaves. pH, total soluble sugars, reducing sugars, sucrose and free amino acids had
significant positive correlation with fecundity, adult longevity and oviposition preference of
whitefly whereas, phenols and tannins had negative correlation. Bifenthrin and fipronil did
not show a significant effect on the relative expression of jhe and vit gene in B. tabaci.
Overall results confirmed the resurgence of B. tabaci in Bt cotton with repeated application of
bifenthrin and fipronil.
Description
Keywords
Citation
Simranjit Kaur (2020). Influence of insecticides on growth and development of Bemisia tabaci (Gennadius) infesting cotton (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.