POPULATION DYNAMICS AND MANAGEMENT OF INSECT PESTS IN RABI SORGHUM
KrishiKosh
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Title |
POPULATION DYNAMICS AND MANAGEMENT OF INSECT PESTS IN RABI SORGHUM
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Creator |
MADHUSUDHAN, K
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Contributor |
MANJULA, K
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Subject |
coffee, harvesting, planting equipment, beans, imports, drying, area, biological phenomena, storage, environmental factors, POPULATION, DYNAMIC, MANAGEMENT, INSECT PESTS, RABI SORGHUM
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Description |
Roving survey was conducted in Chittoor and Nellore districts. Four villages were selected to study the incidence of insect pests of sorghum during rabi 2013-14. In all the villages three pests shoot fly (Atherigona soccata), stem borer (Chilo partellus) and aphid (Rhopalosiphum maidis) infestation was found starting from first fort night of October 2013 to second fort night of February 2014. In Chittoor district, shoot fly Atherigona soccata infestation was first observed in the 1st fortnight of October 2013 (27.20 dead hearts) and the highest was 36.40 per cent in November. The stem borer, Chilo partellus incidence was first observed in the 1st fortnight of October 2013 (23.10 %) and it was continued till 2nd fortnight of February, 2014 (17.50%) ranging from 5.20 to 69.30 per cent. Aphid, Rhophalosiphum maidis incidence was first observed in the 2nd fortnight of October 2013 (11.20%) and continued till 2nd fortnight of February, 2014 (46.5%) ranging ranged from 11.20 to 69.30 per cent. In Nellore district shoot fly incidence was first observed in the month of October 2013 (19.22%) and continued till January, 2014 (26.20%). The incidence was ranging from 6.41 to 79.2 per cent. The stem borer, Chilo partellus incidence was first observed in the 1st fortnight of October 2013 (23.40) and continued till February, 2014 (18.32%) with an incidence of 12.43 to 78.50 per cent. The aphid, Rhophalosiphum maidis incidence was first observed in the month of October 2013 (21.50) and continued till February, 2014 (35.48%). The incidence was ranged from 21.50 to 79.21 per cent. When chittoor and Nellore districts are compared, the infestation of insect pest infestation was more in villages of Nellore district. In population dynamic studies the late 8th November (D3) sown crop had high incidence of shoot pests and early 9th October (D1) sown crop had sucking pest incidence in all the three genotypes tested. Among the genotypes, M-35-1 had influenced higher incidence of shoot fly with 6.87 mean dead hearts per sq.m. Stem borer incidence was high in Kinnera recorded highest 5.21 mean dead hearts per sq.m, N-14 recorded higher aphid (28.18 mean number of aphids per plant) and shoot bug (31.22 mean number of bugs per plant). The correlation studies with the weather parameters revealed that minimum temperature and evening relative humidity had significant positive correlation with shoot fly incidence. Stem borer incidence had non significant negative correlation with minimum temperature, rain fall and number of rainy days. Aphid incidence had significant positive correlation with Sunshine hours. The genotypes CSV-14R, CSV-15, CSV-15R and CSV-216 are the most suitable ones for rabi season since they are resistant to shoot fly, stem borer and also for sucking pests. In insecticide evaluation through seed treatment has higher efficacy other also showed similar efficacy. Though seed treatment (neonicotinoids) and two sprays of neonicotinoids recorded higher efficacy, seed treatment (neonicotinoids) with one spray of neonicotinoids was also effective in controlling both shoot pests and sucking pests. Intercropping with cluster bean (4:2, 6:2, 10:2) also reduced the pest incidence to considerable level. |
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Date |
2016-11-14T10:20:33Z
2016-11-14T10:20:33Z 2014 |
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Type |
Thesis
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Identifier |
212p.
http://krishikosh.egranth.ac.in/handle/1/85332 |
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Language |
en_US
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Relation |
D5022;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
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