STUDIES ON LIFE FERTILITY TABLE OF DIAMONDBACK MOTH, Plutella xylostella (Lepidoptera) ON DIFFERENT HOSTS
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Date
2020-02
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UHF,NAUNI
Abstract
ABSTRACT
The present investigations entitled “Studies on life fertility table of diamondback moth,
Plutella xylostella, (L.) (Lepidoptera) on different hosts” were carried out under laboratory
conditions in the Department of Entomology, Dr. Yashwant Singh Parmar University of
Horticulture and Forestry, Nauni, Solan (HP). The effect of three hosts viz. cauliflower, broccoli
and mustard on biology and life fertility of P. xylostella was studied. Biological studies revealed
that the maximum incubation period of 3.56 days was recorded on mustard followed by
cauliflower (3.04 days) and broccoli (3.01 days). The total larval period was shortest on
cauliflower (9.08 days) and longest on mustard (11.86 days). The total Fecundity was highest on
cauliflower (253.36 females) followed by mustard (245.48 females) and minimum fecundity was
observed on broccoli (182.72 females). Adults fed on cauliflower and broccoli lived longer than
mustard. The Intrinsic rate of increase (rm) and finite rate of increase (λ) were highest on
cauliflower (0.1730 females/female/day and 1.18 females/day, respectively) as compared to
broccoli and mustard. The highest value of gross reproductive rate (GRR) and net reproductive
rates (R0) (126.68 female eggs/female and 33.36 female eggs/female, respectively) were found
when the pest was reared on cauliflower as compared to other hosts. The studies thus revealed
that among the three hosts, cauliflower was the most suitable host for this pest.
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