DISSIPATION KINETICS AND DIETARY RISK ASSESSMENT OF SOME PESTICIDES IN BELL PEPPER UNDER PROTECTED AND OPEN FIELD CONDITIONS
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Date
2024-01
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UHF,NAUNI
Abstract
The present investigations entitled “Studies on natural enemy complex of potato
aphid, Macrosiphum euphorbiae (Thomas)” were conducted during the year 2021 and 2022
at Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh.
The diversity of natural enemies varied with host crop and Tomato was more diverse in
natural enemy complex of M. euphorbiae having 12 species viz., Coccinella septempunctata
(Linnaeus), Hippodamia variegata (Goeze), Episyrphus balteatus De Geer, Melanostoma sp.,
Cheilomenes sexmaculata (Fabricius), Chrysoperla zastrowi sillemii (Esben-Peterson),
Harmonia dimidiata (Fabricius), Oenopia sauzeti (Mulsant), Propylea dissecta Mulsant,
Episyrphus viridaureus (Wiedemann), Sphaerophoria indiana Bigot and Aphelinus asychis
Walker as compared to potato having only 7 species namely C. septempunctata, H. variegata,
E. balteatus, S. indiana, Ischiodion scutellaris (Fabricius), Eupeodes confrator (Wiedemann)
and E. viridaureus. Both M. euphorbiae and its natural enemies (coccinellids, chrysopids,
syrphids and parasitoid) followed negative binomial distribution throughout the season on
potato and tomato. In laboratory studies on demographics, predatory potential and density
responsiveness natural enemies like C. zastrowi sillemi, C. septempunctata, H. variegata, O.
sauzeti and A. asychis showed promise against M. euphorbiae. The predatory potential
increased with increase in age of predators. In each case, significant negative linear
coefficients were obtained after logistic regression analysis between proportion of prey
nymphs consumed (Na/N) and initial prey density (N) which indicated the Type-II functional
response for all the stages of natural enemies. The attack rate decreased and handling time
increased with the advancement of the development stage of the prey in all the cases. The
natural enemies showed mutual interference when two or more individuals foraged in an
arena.
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