The Role of Predators Insects in Regulating Population Densities of Certain Piercing Sucking Pests on Squash Plants in Egypt

Document Type : Original Article

Authors

1 Plant Protection Research Institute, Agricultural Research Center (ARC), Dokki, Giza, Egypt

2 Plant Production Dept., Faculty of Technology & Development, Zagazig University, Egypt

Abstract

Studies
were carried out at Diarb Negim, Sharkia governorate during two successive
seasons 2014-2015 and 2015-2016. Obtained results showed that in autumn
plantation, there were two peaks of Aphis gossypii (Glover) on squash
plants, one peak  at last week of
November and other at third week of December in 2014 season. On the other hand,
Bemisia tabci (Genn.) had three peaks, in second week of November, first
week of December and third week of December in 2014 season and two peaks of
infestation in fourth week of November and December in 2015 season of autumn
plantation while, three peaks in summer plantation were obtained on fourth week
of (April &May) and second week of June in 2015 season respectively.
Investigation revealed that, squash plants infested by few numbers of thrips
during autumn plantation throughout the two seasons. Statistical analysis of
the obtained data cleared highly negative correlation between aphid
&whitefly and temperature in autumn plantation in both seasons. Also, the
mean R.H showed a positive significant correlation on population density of A.
gossypii in second season 2015 of autumn plantation. In summer plantation,
the minimum R.H% showed a negative correlation with Orius spp.
population and a positive significant correlation with C. carnea population
in the first season 2015. The predaceous insects found associated with pericing
sucking pests were Orius spp., Coccinella undecimpuncta L.,
Chrysoperla carnea Steph., Metasyrphus corolla F. and few number of Paederus
alferii (Koch )  and true spider. The
results revealed that Orius spp. had three peak in two season in autumn
plantation, in first and third week of November, and third week of December in
both seasons respectively. Meanwhile there was two peaks in first week of May
and third week of June in 2015 season of summer plantation. Chrysoperla
carnea had two peaks in autumn plantation during two seasons, third week of
November, second week in December in 2014 and fourth week of November, third
week of December in 2015 respectively. Also two peaks in summer plantation
during 2015 season in first week of April and second week of June. 

Keywords

Egyptian Academic Journal of Biological Sciences, F. Toxicology & Pest Control
Volume 9, Issue 3
December 2017
Pages 17-30

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