Journal of Applied and Natural Science 6 (2): 770-778 (2014)
Biology and management of mealybug, Paracoccus marginatus Williams and
Granara de Willink on Jatropha curcas L.
Veeresh Kumar*, S. C. Topagi, B. S. Rajendra Prasad, Revanasidda, K. B. Tharini and
C. T. Ashok Kumar
Department of Entomology, University of Agricultural Sciences, GKVK, Bangalore (Karnataka), INDIA
*Corresponding author, E-mail: email@example.com
Abstract : Jatropha cultivation is gaining importance as potential source of biofuel. Recently Paracoccus marginatus
has been found to cause serious damage on Jatropha. Studies on the biology and management of P. marginatus at
GKVK, Bangalore revealed that the females had three nymphal instars without any pupal stage, while the male had
three nymphal instars besides, pre-pupal and pupal stages. The total nymphal period for female ranged from 14 to
21 days, (mean- 17.32±1.6 days) while for male the range was 16 to 23 days, (mean- 18.9±1.3 days). Bisexual and
parthenogenetic modes of reproduction were observed. The fecundity of the female mealybug ranged from 248 to
967, with an average of 618.9±19 eggs. Evaluation of insecticides revealed that during first spray and second spray,
mean per cent reduction of mealy bug population was highest in profenophos 0.05% (68.05 and 79.35) followed by
buprofezin 0.025% (63.61 and 72.69). Least per cent reduction of mealy bug was observed in the NSKE 5% (17.94
and 25.77) treatment..
Keywords : Insecticides, Insect pests, Jatropha, Natural enemies, P. marginatus.