STUDIES ON PREDATORY FAUNA OF COTTON APHID, Aphis gossypii GLOVER (HEMIPTERA: APHIDIDAE) IN CUCUMBER
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Date
2018-10
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UHF, NAUNI
Abstract
ABSTRACT
The present investigations entitled “Studies on Predatory Fauna of Cotton Aphid, Aphis gossypii
Glover (Hemiptera: Aphididae) in,r” were conducted during the year 2017 at Y.S Parmar
University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh. During the course of study, 11 species
of predators viz. Coccinella septempunctata Linnaeus, Hippodamia variegata (Goeze), Harmonia dimidiata
(Fabricius), Oenopia kirbyi Mulsant, Oenopia sauzetii Mulsant, Oenopia sexareata (Mulsant), Scymnus nubilus
(Mulsant), Cheilomenes sexmaculata (Fabricius), Chrysoperla zastrowi sillemi (Esben-Peterson), Mallada sp.
and Episyrphus balteatus (DeGeer) were found associated with A. gossypii. Among different predators, C.
septempunctata was the most abundant contributing 38.12 per cent of the total predator community The average
incubation, larval, pre pupal and pupal period of C. septempunctata was 3.2, 13.34, 1.90 and 3.90 days,
respectively. The female and male longevity of C. septempunctata was 43.84 and 35.80 days, respectively,
whereas, mean fecundity was 189.60 eggs/ female. Incubation, total larval, pre pupal and pupal period of O.
kirbyi was 3.40, 15.26, 1.30 and 4.80 days, respectively. Female and male longevity of adult beetles of O. kirbyi
was 38.50 and 31.38 days, respectively, whereas, female laid 177.60 eggs/ female. Average incubation, larval,
pre pupal and pupal period of C. zastrowi sillemi was 2.60, 11.62, 1.10 and 8.30 days, respectively. Male
longevity was 26.80 days, whereas, female laid on an average of 398.90 eggs/ female in their life span of 37.60
days. Incubation, larval, pre pupal and pupal period of Mallada sp. was 2.90, 12.68, 1.40 and 9.10 days,
respectively. Female and male longevity of Mallada sp. was 46.28 and 27.36 days, respectively, whereas, the
female laid on an average 128.58 eggs/ females. Total larval consumption of C. septempunctata, O. kirbyi, C.
zastrowi sillemi and Mallada sp. was 579.92, 535.90, 431.06 and 398.50 aphids, respectively. Adult females of
C. septempunctata and O. kirbyi consumed 3376.94 and 2634.78 aphids, whereas, adult males of C.
septempunctata and O. kirbyi consumed 2457.84 and 2012.52 aphids, respectively. All the predatory species i.e.
C. septempunctata, O. kirbyi, C. zastrowi sillemi and Mallada sp. showed a Type II functional response and the
attack rate for all the predators increased and handling time decreased with the advancement in developmental
stages. Hence, among coccinellids C. septempunctata is the most abundant predator and feeding potential was
higher than O. kirbyi, whereas, among chrysopids C. zastrowi sillemi was most abundant and feeding potential
was higher than Mallada sp. Thus, C. septempunctata and C. zastrowi sillemi can be utilized as a component of
integrated pest management programme for the m
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