BIOLOGY AND MANAGEMENT OF PAPAYA MEALY BUG, Paracoccus marginatus WILLIAMS AND GRANARA DE WILLINK (HEMIPTERA: PSUEDOCOCCIDAE) INFESTING MULBERRY
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Date
2013-08-05
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Karnataka were surveyed for the incidence of Paracoccus marginatus Willliams and Granara de Willink and its natural enemies. Maximum
infestation was observed in Bengaluru urban (4.00) followed by
Mysore (3.50), Mandya {3.25) and Chamarajanagara (3.00) districts.
Fourty six plant species belonging to 25 botanical families were
recorded as hosts of the mealy bug. Further, three parasitoids and
four predators were recorded on mealy bug in mulberry eco-system.
Eight species of ants belonging to three subfamilies were found
attending to P. marginatus. The study also revealed variation in the life cycle parameters of
P. marginatus on three varieties of mulberry. The female mealy bug
exhibited three nymphal instars, without any pupal stage, while the
male had three nymphal instars and a pupal stage. On an average the
fecundity was highest on V1 (699.20) followed by S3& (661.00) and Ms
(643.30).
The incidence of P. marginatus on mulberry was first observed
during 2nd week of November,2012, later the incidence gradually
increased to 20.25 mealy bug/ 10 cm shoot length in March,2013 and
then on wards its population declined further. Pest population was
significantly positively correlated with maximum temperature
(r= 0.517**) and sunshine hours (r=0.660**), and negatively correlated
with rainfall (r= -0.268), morning (r= -0.156) and afternoon
(r= -0.611**) relative humidity.
Among the biorational forrrrnlations sprayed on mealy bug,
NSKE@ 2.5ml, 5ml, 10ml significantly decreased the survival of mealy
bug population (15.32, 12.77, 7.00 No./plant) and highest reduction
in pest population (67.60, 76.09, 82.49 %) at low, medium and high
dosage, respectively, at 72 hours after treatment.
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