STUDIES ON COMPARATIVE BIOLOGY AND EVALUATION OF DIFFERENT MASS TRAPPING AND MATING DISRUPTION TOOLS AGAINST PINK BOLLWORM, Pectinophora gossypiella (SAUNDERS) (LEPIDOPTERA: GELECHIIDAE) IN Bt COTTON ECOSYSTEM
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Date
2018-09-30
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR - 584 104
Abstract
The studies on comparative biology of pink bollworm, Pectinophora gossypiella
(Saunders) was carried out at climate change laboratory, MARS Raichur and evaluation of
different mass trapping and mating disruption tools was carried out in farmers’ fields of
Kurdi village, Manvi taluk, Raichur district during kharif 2017-18. Results revealed that life
cycle of PBW on cotton (46.82 ±1.20 days) was found to be more compared to okra (40.58 ±
2.93 days), but it showed no significant difference in respect of morphometric measurements
of life stages. Since recent past (2014-15) the PBW has emerged as notorious pest of Bt
cotton which farmers were unable to control because of its resistance development to cry
toxins and insecticides. Under these paradoxical situations farmers have no choice either to
leave Bt cotton cultivation or to continue with new chemistries which add to total cost. In this
context, sleeve trap (8/acre) and delta sticky trap (10/acre) as mass trapping tools were
evaluated in one acre each in comparison with SPLAT (Specialised Pheromone and Lure
Application Technology). Results revealed that among three dosages of SPLAT (500, 750
and 1250g/acre) applied in four splits (@ 35-40, 65-70, 95-100 and 125-130 DAS, covering
400 source points/acre). The lowest dosage of 500g per acre could able to manage pest by
recording minimum rosette flowers (6.38%), green boll damage (6.86%), locule damage
(12.28%) and moth catches (3.62/trap/week), which greatly influenced more yield of
46.25q/ha with B:C ratio of 2.48, without any statistical difference with higher dosage
treatments. The mating disruption tool was found far superior to mass trapping tools.
Dissipation of pheromone from SPLAT source was initially found more (22.06 % in first
week), which gradually decreased. Even by the end of fifth week (40.36% pheromone left) it
could still be able to confuse male moths, which resulted in less moth catches.
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