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Influence of abiotic factors on behaviour and adult emergence pattern of coconut white grub, Leucopholis coneophora Burmeister (Coleoptera: Scarabaeidae)

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Title Influence of abiotic factors on behaviour and adult emergence pattern of coconut white grub, Leucopholis coneophora Burmeister (Coleoptera: Scarabaeidae)
 
Creator Prathibha P. S.; Kumar A. R. V.; Kesavan Subaharan; Vibina Venugopal.
 
Subject Abiotic factors, Behaviour, Illuminance , Leucopholis coneophora, Rainfall, Soil temperature, White grub
 
Description Leucopholis coneophora Burmeister is a subterranean pest associated with coconut based cropping
systems in south India. Feeding damage causes yellowing of fronds and yield reduction. To develop
appropriate IPM strategy a basic knowledge on insect behaviour is essential. Four years studies indicated that,
adult emergence of L. coneophora was commenced with summer shower in April in Kerala. Delay in summer shower delayed the emergence. After a pause in May, the emergence resumed with the setting of south
west monsoon in June. The beetles did not emerge during dry spells in between the rainy days, when the
soil temperature (at 10 cm depth) was ≥34.5 °C. Emergence of the beetles started at an illuminance of 124.37
± 75.5 l in evening and remained active till 2 ± 0.4 l with a maximum swarming at 32.6 ± 15.1 l. Female emergence and mating occurred at 12.04 ± 8.1 l. Female based sex pheromone mediated communication is evident. Strong competition among the males for mating with emerging female, which was evident by a wider
operational sex ratio in the initial period (1:10.11) that narrowed down to 1:4.33 in later days. The beetles
neither congregate on any host plant nor exhibit phototaxis. Number of beetles entrapped in light traps varied
from 1.5–16.5% and hand picking is highly significant over light trapping. Hence hand picking of beetles daily
in the evening for 2 weeks commencing from the onset of south west monsoon in Kerala, in Indian subcontinent is suggested as a tool in IPM.
 
Date 2019-10-29T07:00:56Z
2019-10-29T07:00:56Z
2018-04
 
Type Article
 
Identifier Phytoparasitica, 2018, 46: 341-353.
1876-7184
http://krishi.icar.gov.in/jspui/handle/123456789/24155
 
Language English
 
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