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Assessment of losses due to Amrasca biguttula biguttula (Ishida) and management of Earias vittella (Fabricius) on okra

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Title Assessment of losses due to Amrasca biguttula biguttula (Ishida) and management of Earias vittella (Fabricius) on okra
 
Creator Chauhan, Vikas
 
Contributor Sharma, S.S.
 
Subject Amrasca biguttula biguttula; Earias vittella; losses; okra; population dynamics; red spider mite;.
 
Description The present studies on the assessment of losses due to Amrasca biguttula biguttula (Ishida) and management
of Earias vittella (Fabricius) on okra were carried out during kharif season at Research Farm of the
Department of Entomology, CCS Haryana Agricultural University during 2013. The losses due to leafhopper
were measured by comparing the average plant height, number of fruits per plant and average fruit weight
per plant in sprayed and unsprayed plots. The insecticide sprayed plots recorded significantly higher average
plant height (66.5 cm), higher average number of fruits (15.6) and higher average fruit weight per plant
(164.5 gm) as compare to unsprayed plots. The losses in plant height, number of fruits, and fruit weight per
plant due to leafhopper were 47.6, 50.0 and 57.2 per cent, respectively. The management of E. vittella was
carried out according the pre fixed insecticide schedules. The observations were recorded by counting the
damaged shoots and fruits, total number of shoots and fruits observed at each picking. The mean lowest
leafhopper population (1.10 nymph/leaf) was recorded in treatment schedule S
3
(seed treatment with
imidacloprid 600 FS @ 5 g/kg seed + 1
st
foliar spray with Prempt 20 EC @ 750 ml/ha + 2
nd
foliar spray with
imidacloprid 17.8 SL @ 100 ml/ha). Similarly, the lowest mite population (4.34 mites/cm
2
) was recorded in
treatment schedule S
2
(seed treatment with imidacloprid 600 FS @ 5 g/kg seed + 1
st
foliar spray with Prempt
20 EC @ 750 ml/ha). The lowest shoot damage (1.11%) was recorded in treatment schedule S
8
(S3
+ 3
rd
foliar spray with thiamethoxam 25 WG @ 100 g/ha + 4
th
spray with spinosad 45 SC @ 190 g/ha + 5
th
spray
with carbaryl 50 WP @ 1.125 kg/ha). The lowest fruit damage on number basis (1.95%) was recorded in
treatment schedule S
4
(S2
+ 2
nd
foliar spray with spinosad 45 SC @ 190 g/ha). On weight basis lowest
damage (1.84%) was recorded in treatment schedule S4
. Schedule S
5 (S
2
+ 2
nd
foliar spray with thiamethoxam
25 WG @ 100 g/ha) was most economical with highest cost to benefit ratio (1:10.25). The population
dynamics of the major insect pests and mite on okra were carried out by counting the nymphs of leafhoppers,
adults of whiteflies, adults and nymphs of mites at weekly interval from three leaves each from upper,
middle and bottom canopy of the plant on randomly selected 50 tagged plants. The leafhopper population
was remained throughout the cropping season with minimum population of 1.6 nymphs/leaf in 27
th
standard
meterological week and the maximum population of 13.9 nymphs/leaf in 32
nd
Standard meterological week.
Whitefly population was observed during early cropping season with maximum population of 3.4 adults/leaf
on 28
th
standard meterological week. Mites population was found during later stage of crop growth and the
maximum population of 18.2 mites per square cm of leaf in 34
th
standard meterological week. The fruit
damage by Earias spp. was observed between 31
st
to 36
th
standard meterological weeks. The maximum fruit
damage of 13.9 per cent was recorded on 36
th
standard meterological week. There is no significant effect of
weather parameters on whitefly and the leafhopper population had negative correlation with maximum
temperature and positive correlation with morning relative humidity. Red spider mite population and fruit
borer damage caused by Earias spp. was significantly and negatively correlated with minimum temperature.
 
Date 2016-09-19T10:21:10Z
2016-09-19T10:21:10Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/77303
 
Language en
 
Format application/pdf
 
Publisher CCSHAU