National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A preliminary survey of thirteen maize-growing areas, representing six districts in the Kashmir Valley, revealed an average of 2.5 to 22.5 per cent plant infestation from C. partless during May-July. In the surveyed areas, Kralpora (KD Farm), Lar and Kangana exhibited relatively high levels of infestation compared to others. The fortnightly survey conducted in the above three hotspot areas showed an average plant infestation of 29.79, 22.22 and 22.02 per cent during July and October at Kralpora, Laar and Kangan. In all these places, larval infestation was observed to increase from July to September and decreased in October. An average of 2.2 to 2.20 larvae / plants were found in the most affected plants during September, which was found to be positively related to the number of exit holes in them. Among the natural enemies, Trichogramma chilonis was found with Ishii, Cotesia ruficrus (Holiday), Euplectrus coimbatorensis Ferrari, and Ichneumonidae, and an unknown species of Tachinidae, along with C. partelus. Cotesia ruficrus was distributed to all study sites, while t. Chilonis was found at three studied hot spot locations. The negligible and sporadic occurrence of the remaining species was found in only one place. On an individual basis, The average egg parasite was determined by Chilonis at 2.97, 7.7 and 7.07 per cent while c. Larvae parasitism by Rufricrus was 9.77, 22.22 and 22.22 per cent at Kralpora, Lar and Kangan, respectively. Both these egg and larva parasites have obtained an average of 22.72, 22.22 and 27.22 per cent parasites with a maximum of 20.22 per cent on saliva. The comparatively good performance of C. rufrix was due to its high population density and super parasitic expression. T. chilonis and C. rufrix has an increase of .7.7777-96.8 and .2 77.77-90.0.77 in both, respectively, in both cases the female oriented sex ratio. The pattern of parasitism was found to be different in three study places due to many abstract and biotic factors.
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