ECOLOGICAL STUDY ON THREE MAJOR INSECT PESTS OF TOMATO PLANTATIONS IN FAYOUM GOVERNORATE.

Document Type : Research articles.

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DEPARTMENT OF PLANT PROTECTION, FACULTY OF AGRICULTURE, FAYOUM UNIVERSITY, FAYOUM, EGYPT

Abstract

Tuta absoluta (Meyrick), Nesidiocoris tenuis (Reuter) and
Bemisia tabaci (Genn.) activities on tomato plants at Fayoum
Governorate were evident during (nili and summer 2011/2012 &
2012/2013). The highest number of immature stages (larvae) of
T.absuluta occurred in November & December 2011 and 2012 (37 and
25 indiv./10 leaves) respectively during nili plantation , while the
numbers of this insect were decreased during the summer plantation
2012 , the highest number recorded on June (20 indiv./10 leaves).
There was highly significant correlation between the T.absuluta
population and mean temp. during nili plantation 2011 . On the other
hand, the highest populations of B. tabaci (97 and 70 indiv./10 leaves)
was recorded in 2nd and 4th week of Oct. during (nili 2011/2012) and
(81 and 64 nymphs/10 leaves) in 2nd week of June and July (summer
2012/2013), respectively. For N. tenuis, the highest number (47 ; 39;
50 and 39 individuals/10 leaves) occurred during 1st and 2nd week of
October during nili 2011 & 2012 and 2nd week of June, 1st week of
July during summer 2012/2013, respectively. Also, six species of
predators were recorded in association with tomato plants, Orius sp < /span>.,
Chrysopa vulgaris ,Syrphus corella, Coccinella undecimpunctata,
Mantis religiosa and Paedrus alfierii.

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