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 66(2b): 553-558
2001
ISSN/ISBN: 1373-7503 PMID: 12425078 Document Number: 536412
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.