Document Type : Original Article
Authors
1
Plant Prot. Inst., Agric. Res. center, Dokki, Giza, Egypt.
2
Eco. Ent. and Agric. Zoology Dep. Fac. of Agirc., Menoufia Uinv., Shebin EI-Kom, Egypt
3
Pests and Plant Prot. Dep., National Res. Center, Dokki, Giza, Egypt.
Abstract
The seasonal life history of the black Parlatoria scale, Par/ataria ziziphus
(Lucas) was studied in EI-Santa region, EI-Gharbiya Governorate, during 1999-2000
years on a heavy infested apple trees. In general, P.zizip < /em>hus was found to have two
generations a year. During which, the egg stage was recorded throughout march-May
and July-September and lasted about 10-12 weeks in both years.
The nymphal stages were present during about 12-14 weeks, in the first
generation April - June in first year and March - July in second one, and throughout
13-14 weeks during July - October in the second generation.
The adult female stages took place, in the first generation, lasted about 15
weekes during June -September in 1999 and May - September in 2000. In the
second generation, lasted about 35-37 weeks, during September- May and
September - first June in the first and second years, respectively.
The generation period lasted about 16 weeks in the first generation March -
September in the first and second years, and lasted about 33-35 weeks, July - next
May and July - next June in the first and second years, throughout the second
generation.
The total number of eggs was 49.0 .± 4.06 and 33.8 .± 6.46 eggs I female for
the first generation and second generation, successively.
The occurrence period of immature male stage of first generation lasted
about 14-16 weeks during April- July and March-July in the first and second years.
While, in the second generation, lasted about 16-17 weeks during July - November in
both years. The adult male, lasted about 7-9 weeks in the first generation, during June
- July and may- July in the first and second Years. The second generation lasted
about 13-15 weeks during August- first December in the first year and August -
November in the second year.
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