BIOLOGY AND MANAGEMENT OF HARAR BORER
Loading...
Date
2019-11-18
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
COLLEGE OF HORTICULTURE AND FORESTRY, DR Y S P UHF, NERI, HAMIRPUR
Abstract
Peak infestation of harar borer were recorded in the month of July (77.5%) and in the month of September (72.5%). The biology study revealed that female laid whitish creamish circular egg singly on the fruits and there were five larval instars. Total larva period ranged from 1520 days with an average of 17.90±0.58 days. Female longevity ranged from 6 to 8 days (7.1±0.23). Female moth length ranged from 11.50-12.20 mm (11.91±0.06) and 21.68-22.85 mm (22.23 ±0.12) in width. Male longevity ranged from 4 to 6 days (5.1±0.27). Male moth length ranged from 10.03-11.50 mm (10.78±0.15) and 20.14-21.45 mm (20.90 ±0.13) in width. The bio-efficacy study revealed that in the initial stage when the first spray was applied the mean infestation of harar fruit borer was low even in control (41.10%) after 21 days of spray all the test treatments being superior over control. After the final spray the experimental result showed that the percent infestation in all the treatments were below 43 per cent and whereas in control, it was found around 70.00 per cent. Among the tested treatments the per cent infestatrion was lowest in chlorantraniliprole 18.5 w/w @0.005% (7.77%) followed by cyantraniliprole 10.26 OD @0.01% (9.99) and fenvalrate 20 EC @0.012% (14.43%) were proved effective. The biopesticides namely agniastra @ 2.5% and synthetic insecticide monocrotophos @ 0.108% were found least effective with percent infestation were recorded 42.21% and 24.43 %. However agniastra result were not superior over other chemical treatment but agniastra caused deformity among the adults of the pest which may have resulted in the decrease of percent infestation for next generation.
Description
Keywords
null