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Life cycle of a non‐diapausing population of the two‐spotted spider mite, Tetranychus urticae Koch in a pear orchard
Author(s) -
Takafuji Akio,
Kamibayashi Mitsuji
Publication year - 1984
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02515511
Subject(s) - pear , biology , orchard , overwintering , spider mite , tetranychus urticae , population , pyrus communis , diapause , horticulture , botany , mite , demography , sociology , larva
Summary The life cycle of a non‐diapausing T. urticae population was studied in a pear orchard in the southern part of Okayama Prefecture, western Honshû, Japan. The mites overwintered only on biennial weeds in the orchard without entering diapause, started to increase in number in early spring on them and then moved to other weeds as they emerged. The occurrence of the mites on pear began in early May several weeks after the unfolding of pear leaves and the population on pear was initiated by the migrants from the weeds around the base of pear trees. The population on pear showed two distinct peak occurrences, one in June and the other in mid‐autumn. After pear leaves dropped in late autumn, the mites returned to biennial weeds for overwintering.