Distribution,seasonal incidence and management of eucalyptus gall wasp Leptocybe invasa fisher and la salle (Hymenoptera: Eulophidae) with special reference to native parasitoids
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Title |
Distribution,seasonal incidence and management of eucalyptus gall wasp Leptocybe invasa fisher and la salle (Hymenoptera: Eulophidae) with special reference to native parasitoids
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Creator |
Harish.Kulkarni
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Contributor |
A.S.Vastrad
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Subject |
Agricultural Entomology
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Description |
Investigations on “Distribution, seasonal incidence and management of eucalyptus gall wasp Leptocybe invasa Fisher and La Salle (Hymenoptera: Eulophidae) with special reference to native parasitoids” were carried out during 2009-10 at the Department of Agricultural Entomology, College of Agriculture, UAS, Dharwad. Seasonal incidence studies revealed that top portion of the sample harbored more of first and second stage galls. Middle portion of the sample contained more of second, third and fourth stage galls. Fourth and fifth stage galls were more in bottom portion of the sample. Roving survey conducted in 44 locations of 10 districts revealed that L. invasa has firmly established throughout Karnataka and highest number (35.23) of galls were recorded at Timmapur and lowest (5.04) at Nandi Hills per 30 cm shoot length. Infestation of gall wasp was seen throughout the year. Megastigmus sp. was recorded from 19 locations and the per cent parasitization was highest (61.14 %) at Machagondanahalli (Bengaluru Rural Districts). Aprostocetus gala was recorded from nine locations and the per cent parasitization was highest (24.82 %) at Belgaum. Quarterly survey conducted at Vaddarahatti, Kulwalli, Prabhunagar and Kittur indicated that number of adult emergence was highest (553) in Vaddarahatti followed by Kittur (541). Parasitoids were recorded at all the locations and per cent parasitization ranged from 10.16 per cent to (Vaddarahatti) to 46.18 per cent (Vaddarahatti). Total life cycle of L. invasa from oviposition to adult emergence was 123.6+3.16 days. A total of 1470 and 343 Megastigmus sp. and Aprostocetus gala were recovered from two greenhouses where release and recovery studies were conducted. Neonicotinoids viz., acetamiprid, imidacloprid and thiacloprid were found effective as cutting dip up to 45 days. Seed treatment with thiacloprid, imidacloprid and acetamiprid was effective in reducing the infestation up to 30 days. Thiacloprid and imidacloprid were effective as foliar spray. |
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Date |
2016-11-09T18:08:05Z
2016-11-09T18:08:05Z 2010 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/84762
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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