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THE PEA THEIPS (KAKOTHRIPS ROBUSTUS)
Author(s) -
WILLIAMS C. B.
Publication year - 1915
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.1744-7348.1915.tb07994.x
Subject(s) - biology , larva , moulting , orange (colour) , thripidae , horticulture , pupa , brood , zoology , botany , thrips
Summary1 Peas and beans in England and Western Europe are damaged by a thrips Kakothrips robustus (sub‐order Terebrantia , family Thripidae).2 The adults appear from May to August; males only in the earlier part. The eggs are laid chiefly in the tissue of the stamen sheath. They hatch in about nine days. The larvae are orange‐yellow with the last two abdominal segments dark brown. There is one moult. The second stage when full fed (about 24 days from the laying of the egg) descends into the ground to a depth of from three to twelve inches. 3 The full fed larva remains in this position till the following spring when the two pupal stages are passed through and the adult emerges. There is only one brood each year. 4 The damage is greatest on light soils. No varieties are immune, but early sown plants are less damaged. A chalcid parasite, Thripoc‐tenus brui , has been recorded from France, but has not been found in England. 5 Artificial control is difficult. Spraying is only of use when the larvae are feeding openly on large pods. Soil fumigation during the winter should give good results, but must be done to a sufficient depth.