| Titles |
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English :
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Annual generations, preferable surface and horizontal distribution of Hemiberlesia lataniae (Signoret) and its associated parasitoids on guava trees
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Arabic :
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الأجيال السنوية والتفضيل السطحى والتوزيع الأفقي لحشرة اللاتانيا القشرية والطفيليات المرتبطة بها على أشجار الجوافة
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| Abstract |
Field studies were conducted at Hannout village, Kafr Saker district, Sharkia Governorate during three successive years (1999, 2000 and 2001) with the aim of studying the annual number of generations, their durations, preferable surface and horizontal distribution of Hemiberlesia lataniae and its associated parasitoids on guava trees. The obtained results revealed that:
1. H. lataniae had two generations annually in both inner and outer zones of guava trees during each year.
2. The generation durations were varied according to the year and tree zones, lasting 2 – 6 months.
3. The insect pest and its associated parasitoids preferred the upper surface of guava leaves than the lower one.
4. The general total numbers of alive stages in different directions of the tree and central core during the three years could be arranged descendingly according to their relative densities as follow: north (26.55 %), central core (26.35 %), east (17.56 %), south (14.94 %) and west (14.60 %).
5. The relative densities of parasitoids appeared similar trend during the three years showing 25.91, 24.58, 24.19, 14.96 and 10.36 % in north direction, central core, east, south and west directions, respectively.
6. Mathematical calculation showed that the insect pest occurs almost in north-eastern direction during the second and third years, while during the first one it occurs in north-western direction. The parasitoids were more abundant in eastern direction during the first year and in north-eastern direction during the second and third ones.
Key words: Hemiberlesia lataniae, parasitoids, generations, preferable surface, horizontal distribution.
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| Publication year |
2004
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| Pages |
271-292
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| Organization Name |
Plant Protection Research Institute (PPRI)
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| City |
الزقازيق
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| serial title |
مجله الزقازيق للبحوث الزراعية
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| ISSN |
1110-0338
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| Author(s) from ARC |
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| External authors (outside ARC) |
على عبد الحميد شاهين
كلية الزراعة – جامعة الزقازيق
كامل عبد اللطيف عبد الله حماد
كلية الزراعة – جامعة الزقازيق
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| Agris Categories |
Protection of plants - General aspects
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AGROVOC
TERMS |
Parasitoids.
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| Proposed Agrovoc |
Hemiberlesia lataniae;
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| Publication Type |
Journal
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