ISHS Acta Horticulturae 291: III International Mango Symposium
LOSS ASSESSMENT, ECOLOGY AND MANAGEMENT OF MANGO FRUITFLY, DACUS SP. |
| Author: | G. Singh |
| Abstract:
The studies conducted at Pantnagar indicated that fruit fly damage in physiologically mature fruit of 'Dashehari' varied from 3.6 to 10% from 17 June to 13 July, while in fully ripe, dropped fruit it ranged from 10 to 25.9% from 24 June to 13 July. Highest damage (56.6%) was recorded in fully ripe, dropped fruit of 'Mallika' followed by 'Totapari' (37.8%). Pupal period was longest (18 days) at 15°C and shortest (6 days) at 35°C. Pupal mortality was 92.5% at both these temperatures and lowest at 27°C. At 30cm depth of pupation adult emergence was zero followed by 20 cm (20%), 10 cm and 5 cm depth. Total generation period was 16, 17, 18 and 15 days for first to fifth generations respectively, with mean temperature 36.1, 35.1, 34.5, 33.8 and 37C, and relative humidity 60.2, 59.5, 60.3, 50.5 and 65.7%, respectively. Mean apparent and real mortality was observed highest in early instar larvae followed by pupae and lowest in late instar larvae. The indispensable mortality was highest in early instar larvae followed by pupae and late instar larvae. Generation survival fraction was highest in fourth generation. In third and fifth generation early stage larva was the key factor, but in first, second, and forth, pupal stage was the key factor. Aldrin 5% dust when mixed in soil gave highest residual toxicity (23.4%) after 15 days, as compared to BHC endosulfan and quinolphos to the falling mature larvae. | |
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