Effectiveness of second mating for two incompatible types of the citrus red mite,Panonychus citri (McGregor) |
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Authors: | Akio Takafuji |
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Institution: | (1) Entomological Laboratory, College of Agriculture, Kyoto University, 606 Kyoto, Japan |
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Abstract: | Summary Two types of the citrus red mite,Panonychus citri (M.) occur in some pear orchards in the intermediate latitudal areas in Japan during a certain period of the year (Takafuji andMorimoto, 1983): one is a diapausing type (DP) and the other a non-diapausing type (C). These two types are incompatible: no adult females are produced from the crosses between them (Takafuji andFujimoto, 1985). In the present study, females of each type were doubly crossed, first with a male of the other type, and then with
a male of the same type, to examine the effectiveness of the second mating. In the females of the DP type, the second mating
with a male of the same type was almost totally ineffective. In contrast, for the females of the C type the effectiveness
of the second mating depended on the durations of the first and second matings: the famles produced female offspring only
when the duration of the first copulation with a male of the DP type was brief and the second copulation with a male of the
C type lasted relatively long. The results suggested that if the two types coexist, the intercrossing between them will favour
the C type over the DP type. |
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