TEMPORAL DIVERSITY OF PARASITOIDS IN RAGI, PADDY AND SUGARCANE ECOSYSTEMS
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Date
2017-07-26
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
A study was conducted from March, 2016 to February, 2017 at the College of
Agriculture, V. C. Farm, Mandya, Karnataka to determine the parasitoid faunal complex,
their abundance and temporal diversity in ragi, paddy and sugarcane ecosystems. Twenty
yellow pan traps per crop were laid at fortnightly intervals. Of the 24,586 parasitoid
specimens collected from the three agroecosystems, 7725 were from ragi, 8248 were
from paddy and 8613 were from sugarcane. Eighteen parasitoid families occurred in
ragi and paddy fields while 19 families occurred in the sugarcane field. The parasitoid
families collected were Trichogrammatidae, Mymaridae, Encyrtidae, Aphelinidae,
Eulophidae, Chalcididae, Eurytomide, Eupelmidae, Torymidae, Ichneumonidae,
Braconidae, Scelionidae, Platygastridae, Ceraphronidae, Megaspilidae, Evaniidae,
Cynipidae and Diapriidae. All families collected occurred in all three ecosystems with the
exception of Perilampidae, which occurred only in the sugarcane ecosystem. Scelionidae
was most abundant and richest in genera (33) in all three ecosystems, followed by
Encyrtidae (30), Trichogrammatidae (25), Mymaridae (14), Aphelinidae (10) and
Platygastridae (8). Of the two-functional groups of parasitoids, viz., egg and other (larval,
pupal and adult) parasitoids, the egg parasitoids were more abundant in all the three
ecosystems. Parasitoid abundance correlated significantly with rainfall in the paddy
ecosystem; no such correlation was found in the other two (ragi and sugarcane)
ecosystems. Temperature did not correlate significantly with parasitoid abundance in all
three ecosystems. Parasitoid diversity (Shannon-Wiener, Simpson and Margalef’s) was
higher in monsoon and winter than in other seasons but it didn’t differ significantly
between the three ecossytems.
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