Evaluation of chilli hybrids for resistance against mite, Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae)
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Date
2014
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CCSHAU
Abstract
Studies on the screening of fourteen chilli hybrids against Polyphagotarsonemus latus revealed wide difference in population of P. latus (2.53 to 6.28 mites per leaf), however, none of them was found immune to this pest. Among the hybrids, maximum population developed on hybrid 10/CHIhyb-7 (6.28 mites/leaf) followed by 5.70 mites/leaf on 10/CHIhyb-6; both were statistically comparable with each other but significantly higher than population recorded on other hybrids. Leaf wise, maximum population build up of P. latus was noticed on the top leaves (36.59 %) followed by middle (33.51 %) and bottom (29.89 %) chilli leaves. A peak in mite population was recorded in second fortnight of October (9.54 mites/ leaf), which afterwards showed a gradual decline in number. Hybrids 9/CHIhyb-4, 9/CHIhyb-10 and 9/CHIhyb-8 were marked the least susceptible hybrids; Kashi Anmol, 10/CHIhyb-3, 10/CHIhyb-5 and 10/CHIhyb-16 as slightly susceptible; 10/CHIhyb-2, 10/CHIhyb-9, 10/CHIhyb-10, 10/CHIhyb-11 and 10/CHIhyb-12 as moderately susceptible and 10/CHIhyb-6, 10/CHIhyb-7 as highly susceptible hybrids. A comparison of fertilizer treatments showed that farm yard manure @ 20t/ha was most effective, followed by vermicompost (5t/ha), poultry manure and neem cake (2t/ha) treatment as compared to NPK and control. P. latus population showed significant positive correlation with minimum temperature (r = 0.73), morning (r= 0.70) and evening actual vapour pressure (r= 0.65). Feeding by mites leads to formation of feeding patches, bronzing of leaves, downward curling, stunted growth, and elongation of petiole of older leaves along with younger small sized curled leaves. Negative and highly significant correlation was recorded between mite incidence and fruit number, fruit length and yield. Nitrogen, phosphorus, potassium, total sugar and non reducing sugars of chilli leaves showed a significant decline with increase in P. latus infestation whereas, phenol and reducing sugars increased in mite damaged leaves .
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Keywords
Biological phenomena, Wastes, Vermicomposting, Animal products, Crop residues, Biological development, Concentrates, Nitrogen, Toxicity, Productivity