Population dynamics and varietal/germplasm screening against ber fruit fly, Carpomyia vesuviana (Costa) on ber
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Date
2017
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CCSHAU
Abstract
The present studies entitled “Population dynamics and varietal/germplasm screening against ber fruit fly,
Carpomyia vesuviana (Costa) on ber.” were carried out during 2016-17 at ber orchard of Chaudhary
Charan Singh Haryana Agricultural University, Regional Research Station, Bawal. The first appearance of
maggots was observed in 1st fortnight of November, 2016 and maximum maggots (7) per fruit were
recorded during February, 2017 at mean temperature range of 11.5 to 31.3 ⁰C and relative humidity range
of 17.8 to 77 per cent. The infestation reached to the peak level of 44.00 per cent between February 2 to
11, 2017 when temperature ranged from 7.9 to 22.5 ⁰C and relative humidity ranged from 63.9 to 95.7 per
cent. The infestation of C. vesuviana exhibited positive correlation with morning relative humidity (r=
0.723), evening relative humidity (r= 0.797) and total rainfall (r= 0.361). The studies on
varietal/germplasm screening revealed that the variety/germplasm Kaithali exhibited maximum fruit fly
infestation (51.06 %) and BS- 1 showed minimum fruit fly infestation (1.51 %). Fruit fly infestation had
positive correlation with fruit size (r= 0.317), average fruit weight (r = 0.369), pulp : stone ratio (r =
0.351), total soluble solids (r= 0.342) and Vitamin C (r = 0.345). However fruit fly infestation was
negatively correlated with fruit firmness (r= -0.326), acidity content (r= -0.374) and total phenolic content
(r= -0.774). Early flowering and maturing varieties/germplasm exhibited more fruit fly infestation as
compared to late flowering and maturing varieties/germplasm. Besides fruit fly, other insect pests were
also recorded, which caused considerable damage to ber trees viz. chafer beetles, Cow bug (Oxyrachis
spp.), Fruit borer (Meridarchis scyrodes Meyr), Hairy caterpillar (Euproctis lunata), Metallic shield bug
(Scutellera perplexa Westwood), Lac Insect (Kerria lacca) and Hard gall mite (Eriophyes cernus). An
overall consideration of all the parameters indicated that no single factor governed the infestation of fruit
fly independently and the extent of infestation was an outcome of the contribution of all the factors
together.
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