The colonization preference and population trends of larval fig psylla, <Emphasis Type="Italic">Homotoma ficus</Emphasis> L. (Hemiptera: Homotomidae) |
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| Authors: | Nimet Sema Gencer Kiymet Senan Coskuncu Nabi Alper Kumral |
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| Institution: | (1) Plant Protection Department, Faculty of Agriculture, Uludag University, 16059 Bursa, Gorukle, Turkey |
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| Abstract: | The colonization preference and population trends of larval fig psylla Homotoma ficus L. were studied in Bursa, northwestern Turkey, from March 2000 to July 2001. Homotoma ficus overwintered at the egg stage on terminal buds and lenticels of shoots. Larval emergence occurred on 30th and 11th March
in 2000 and 2001, respectively. Degree-day (DD) accumulations since 1st January indicate that the emergence of first larvae
averaged 47 DD based on the larval developmental threshold of 10.9°C. Although the population trends of Homotoma ficus larvae were affected by temperature and rainfall, there was only significant relationship between larval abundance and temperature.
The first instar larvae significantly preferred the bottom and the inside stipule of leaves. The second instar larvae distributed
not only on expanding green tissues but also on both the upper and lower surface of leaves corresponding to the fig bud development
period. Third to fifth instars colonized significantly greater on the bottom of leaves compared with the stipule and upper
surface. In addition, significant linear relationship was found between fig phenology and cumulative larval counts. The importance
of the colonization preference of larval instars and the use of fig phenology as well as DD for timing of insecticide treatments
are discussed. |
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| Keywords: | Homotoma ficus Larval colonization preference Climatic factors Fig phenology |
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