EFFECT OF Apsylla cistellata Ruckton INFESTATION ON YIELD AND GROWTH OF MANGO TREES
The mango trees sprayed with monocrotphos (0.04%) and dimcthoate
(0.03%) resulted into lesser number of shoot galls i.e. 16.37 and 20.50 during 2002 and 12.50 and 14. I2 galls/IO shoots during 2003. respectively in comparison to 53.50 and 38.25 galls/IOshoots in control plants during respective years. Most of the galls (>90%) ill monocrotophos and dimethoate treated plams were nymph free thereby resulting in higher yield i.e. 185.0 and 181.2 kg/tree, respectively. However, in control plants ollly 1.2 number of galls out of 10 selected galls were nymph free, hence lower yield (91 kg/tree) was recorded. Further the mean number of dried shoots was higher in control plants (5.8) and only 1.2 number of shoots out of 10 infested shoots were converted into reproductive shoots in comparison to 5.0 and 4.2 in monocrotophos and dimethoate treated plants, respectively.
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