Studies on ecology of mites and sucking pests of pomegranate and management of Tenuipalpus punicae Pritchard & Baker (Acari: Tenuipalpidae)
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Date
2009-08-30
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University of Agricultural Sciences GKVK, Bangalore
Abstract
In the present investigation duration of egg, larva, protonymph and
deutonymphal stages of Tenuipalpus punicae was 180 and 192 h, 96 and 120 h, 60
and 84 h, 60 and 84 h for males and females, respectively. The first, second and
third quiescent periods lasted for 38 and 48, 48 and 52 and 36 and 48h for males
and females, respectively. In case of Oligonychus punicae the duration of egg:
102.4-111.6h, larva: 35.6 and 44.2h, protonymph: 27.4 and 36.2h, deutonymph:
30.2 and 35.2h for males and females, respectively. The first, second and third
quiescent periods lasted for 27.8 and 36h, 27.8 and 34.8h, 31.2 and 36.4h for
males and females, respectively. The total duration of development from egg to
adult ranged from 511-628h in Tenuipalpus punicae, and 282.4-334.4h for
Oligonychus punicae. Leaves in top and middle canopies of pomegranate plant
harboured significantly more number of eggs 0.74 and 0.68/leaf, respectively of T.
punicae, which indicated the preference of mites for leaves at the top and middle
canopies for oviposition. However, active stages preferred to feed on the leaves in
the middle canopy with1.04 mites/leaf. Overall mite population including eggs and
active stages was significantly more on middle canopy leaves (1.72 mites/ leaf)
compared to other canopy leaves. The incidence of T. punicae was low from
September 2007 to December 2007, later the population mite increased till
February 2008. The other pests like pomegranate aphid (Aphis punicae), thrips
(Scirtothrips dorsalis), mealybugs (Planococcus citri) and the eriophyid mite
(Aceria granati,), were observed and their incidence was negligible. Wettable
sulphur at 2.5 g and dicofol at 2.5 ml per litre of water were found very effective,
the other acaricides like propargite, fenpyroximate, chlorfenapyr and buprofezin
were also found effective.
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