Seasonal Incidence of Mango Leaf Hopper Amritodus atkinsoni (Leth.) and Evaluation of Some Newer Insecticides
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Date
2006
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MPUAT, Udaipur
Abstract
The field trial were carried out at Gulab garden, Udaipur to evaluate efficacy of some
newer insecticides against the mango leaf hoppers and study their seasonal incidence.
Bioassay of the insecticides was done in the laboratory of Department of Entomology, RCA,
MPUAT, Udaipur. The trial depicts that the appearance of the mango leaf hoppers was in last
week of February with 1.93 hoppers per sample, when the mean temperature and relative
humidity were 21.150C and 51.50 per cent, respectively. Thereafter a sharp increase in leaf
hopper population reaching to a high in the last week of March with 23.40 mango leaf hopper
per sample, the mean temperature and relative humidity were 24.550C and 24.50 per cent,
respectively. The density of the population declined after last week of March to up to second
week of April. However, the pest reached its peak during last week of April with 50.27
mango leaf hoppers per sample. At the peak the mean temperature and relative humidity were
30.100C and 50.50 per cent, respectively. After that the pest population density was lowest
during last week of July with 3.40 hoppers per sample.
The relative toxicity of different insecticides, Imidacloprid (6.06 times more toxic),
Phosphamidon (2.97 more toxic), Monocrotophos (2.83 more toxic), Metasystox (2.42 more
toxic), Bifenthrin (1.17 more toxic) and Acephate (1.00 as standard) was evaluated.
Imidacloprid 17.8 SL (0.005 per cent) was most effective which gave 76.92, 86.67, 93.82 and
80.19 per cent reduction population of the pest at 1,3,7 and 15 days after spray. It was
followed by the other treatments. The standard check (Monocrotophos 36 SL 0.03 per cent)
remained superior over Bifenthrin 10 EC (0.05 and 0.03 per cent) and metasystox 25 EC
(0.05 and 0.025 per cent). While the least effective treatment was Acephate 75 SP (0.0375 per
cent) giving an average of 58.43 per cent reduction of the pest. Imidacloprid 17.8 SL was the
most toxic among all the toxicants. In present experiment no visual phytotoxic symptoms on
mango plants were noted. Hence all the treatments were found to safe for mango plants at all
the tested doses of different insecticides.
Description
Seasonal Incidence of Mango Leaf Hopper Amritodus atkinsoni (Leth.) and Evaluation of Some Newer Insecticides
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Citation
Khatik and Kumar, 2006