Ecological studies on the snow scale insect, Lineaspis striata (Newstead) (Homoptera: Diaspididae) on Thuja orientalis in Egypt

Moursi, K.E.; Mesbah, H.A.; Mourad, A.K.; Abdel Razak, S.I.

Mededelingen van de Faculteit Landbouwwetenschappen - Rijksuniversiteit Gent 66(2B): 553-558

2001


ISSN/ISBN: 0368-9697
Accession: 003721735

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Abstract
The snow scale insect, Lineaspis striata (Newstead) was recorded as an important insect pest of Thuja orientalis in Alexandria Governorate, Egypt. The present study revealed that the total individuals were in high numbers, (143.7±43; 141.8±20.7 and 149.0±48.5) during May, June and January, respectively. The fluctuating numbers of the immature stages have two peaks during June and November (6.9±0.7) and (20.5±5.0), respectively. The numbers of adult males reached the maximum (73.9±7.5) in October, while the females reached the maximum (88.7±2.2) in January. The insect has two annual generations. It is usually parasitized with Encarsia citrina (Aphelinidae), with maximum parasitization rate of 17.8±2.8 during August.