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The life‐history of the eriophyid mite Aculus schlechtendali on apple in South‐east England
Author(s) -
EASTERBROOK M. A.
Publication year - 1979
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1979.tb06502.x
Subject(s) - biology , mite , botany , horticulture , bark (sound) , shoot , malus , hibernation (computing) , hardiness (plants) , rosaceae , cultivar , ecology , state (computer science) , algorithm , computer science
SUMMARY During 1975–77 the life‐history of Aculus schlechtendali was studied in apple orchards. The morphology of the mite and its development at a range of temperatures were studied in the laboratory. Deutogynes of A. schlechtendali hibernated mainly in small permanently dormant buds and under loose bark on spurs and around buds on 1‐yr shoots, and moved into fruit buds between the bud burst and pink but stages and into vegetative buds as the buds began to swell. Populations on leaves reached a peak in August and mite feeding at high density caused browning of the under surfaces. The return to hibernation sites began in July. The developmental stages of the mite are described. A generation took c . 39, 16 and 10 days at 10, 16 and 22 d̀C, respectively. Protogynes laid totals of 67–102 eggs at a rate of 1.7, 2.4 and 2.8 eggs/day at 10, 16 and 22 d̀C: deutogynes laid 21–47 eggs after hibernation at a rate of 1.3 and 1.6 eggs/day at 10 and 16 d̀C. The species was found only on cultivars and species in the genera Malus and Pyrus .