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Studies on population dynamics and chemical control of major insect pests of okra (Abelmoschus esculentus L. moench)

KrishiKosh

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Title Studies on population dynamics and chemical control of major insect pests of okra (Abelmoschus esculentus L. moench)
 
Creator Aarwe, Rajesh
 
Contributor Pachori, R.
 
Subject biological phenomena, enzymes, diseases, organic compounds, grading, heterocyclic compounds, byproducts, meat, developmental stages, self help
ENTOMOLOGY
biological phenomena, enzymes, diseases, organic compounds, grading, heterocyclic compounds, byproducts, meat, developmental stages, self help
 
Description ABSTRACT

Present research work on “Studies on population dynamics and chemical control of major insect pests of okra (Abelmoschus esculentus L. Moench)” was carried out in the experimental field of Department of Entomology, Live Stock Farm, Adhartal, JNKVV, Jabalpur (M.P.) during kharif 2014. The experiments were conducted with the following objectives:

1. To study the succession of insects and natural enemies in okra.

2. To study the population dynamics of major insect pests of okra in relation to weather parameters.

3. To study the efficacy of some new insecticides against jassids, aphids and shoot & fruit borer of okra.

Five different species of insect pests and one natural enemy were recorded on the okra crop at experimental field of Department of Entomology, Live Stock Farm, Adhartal, JNKW, Jabalpur (MP.) during kharif 2014 which represented 3 orders (Hemiptera , Lepidoptera and Coleoptera) and 6 families (Cicadellidae, Aphididae, Aleyrodidae, Pyrrhocoridae, Noctuidae and Coccinellidae).

The jassid appeared when the crop age was about 23 days old i.e. during vegetative stage and remained available upto maturity stage of the crop. Aphid was the next insect pest to appeared on the crop during the vegetative stage and remained available upto reproductive stage (flowering / fruiting stage) of the crop i.e. 18th September 2014. Whitefly was also appeared at vegetative stage and remained available upto the reproductive stage (flowering / fruiting stage) of the crop i.e. 2nd October 2014. Red cotton bug was appeared on the crop, when the crop age was about 85 days old and present for a very short duration (up to 99th day) i.e. during the maturity stage of the crop. Shoot and fruit borer was appeared on the crop, when the crop age was about 47 days old i.e. during reproductive stage and remained available upto maturity stage of crop. Lady bird beetle appeared when the

crop age was about 42 days old and remained available from vegetative to reproductive stage (84th day).

The jassid, Amrasca biguttula biguttula (Ishida) was first observed during 31st SW (first week of August) (i.e.30 July to 5 August) and remained available upto maturity stage of the crop with peak activity during 37th SW (i.e.
10th to 16th September, 2014).

Correlation between various abiotic factors and jassid population showed that maximum temperature was found to be significant positive correlation. Further, minimum temperature, sunshine, no. of rainy days, morning & evening vapour pressure and evaporation exhibited positive influence while morning & evening relative humidity, wind velocity and rainfall showed negative influence with jassid population but statistically found to be non-significant.

The activity of aphid, Aphis gossypii (Glover) was first recorded in the first week of August (31st SW, 30 July to 5 August) with peak activity during
36th SW (i.e. 3rd to 9th September).

Correlation between various abiotic factors and aphid population showed that maximum & minimum temperature, morning relative humidity, sunshine hour, no. of rainy days, morning and evening vapour pressure were found to be positive correlation while evening relative humidity, wind velocity, rainfall and evaporation showed negative correlation with aphid population but statistically found to be non significant.
The whitefly, Bemisia tabaci Genn. was first observed during 31st SW (first week of August) (i.e.30 July to 5 August) and remained available upto reproductive stage (flowering / fruiting stage) of the crop i.e. 2nd October 2014 (40 SW, 1st to 7th October) with peak activity during 34th SW (i.e. 20th to 26th August).

Correlation between various abiotic factors and whitefly population showed that minimum temperature was found to be significantly positive. Further, maximum temperature, evening relative humidity, rainfall, no. of rainy days, morning & evening vapour pressure showed positive correlation while,

morning relative humidity, wind velocity, sunshine and evaporation showed negative correlation with whitefly population but statistically were found to be non-significant.

The activity of shoot and fruit borer, Earias vittella Fab. was observed from 35th SW (first week of September) (i.e. 27th to 2nd August) with peak activity during 36th SW (i.e. 3rd to 9th September). Correlation between shoot and fruit borer, E. vittella and morning & evening relative humidity, rain fall and no. of rainy days showed positive correlation while, maximum
temperature, minimum temperature, wind velocity, sunshine, morning & evening vapour pressure and evaporation showed negative correlation with shoot and fruit borer population but statistically were found non significant.

The various molecule evaluated in which emamectin benzoate 5 SG @

12 g a.i./ha against shoot and fruit borer (Earias vittella F.) and thiamethoxam

25% WG @ 50 g a.i./ha against jassid (Amrasca biguttula biguttula Ishida) and aphid (Aphis gossypii Glover) were found significantly more effective on okra (Abelmoschus esculentus L. Moench) during kharif 2014.

Maximum cost benefit ratio was obtained in triazophos 40% EC @ 400 g a.i./ha (1:15.60) this was followed by thiamethoxam 25% WG @ 25 g a.i./ha (1:14.25), imidacloprid 17.8% SL @ 21.36 g a.i./ha (1:13.11), thiamethoxam
25% WG @ 50 g a.i./ha (1:12.89), emamectin benzoate 5%SG @ 12 g a.i./ha

(1:9.83) and emamectin benzoate 5%SG @ 10 g a.i./ha (1:9.27), respectively.
 
Date 2016-06-22T11:35:54Z
2016-06-22T11:35:54Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67668
 
Language en
 
Format application/pdf
 
Publisher JNKVV