. Cooperative economic insect report. Beneficial insects; Insect pests. INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES GARDEN CHAFER (Phyllopertha horticola (L.)) Economic Importance: This chafer is a rather general feeder, both larva and adult, on many economic plants. It is of major importance in forest nurseries in the British Isles where the larvae severely damage roots of seedlings. Such damage is also reported on young apple seedlings in southern Czechoslovakia. Serious infestations occurred on grasslands in southern and central Wales between 1935 and 1943. The pest also causes injury t
. Cooperative economic insect report. Beneficial insects; Insect pests. INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES GARDEN CHAFER (Phyllopertha horticola (L.)) Economic Importance: This chafer is a rather general feeder, both larva and adult, on many economic plants. It is of major importance in forest nurseries in the British Isles where the larvae severely damage roots of seedlings. Such damage is also reported on young apple seedlings in southern Czechoslovakia. Serious infestations occurred on grasslands in southern and central Wales between 1935 and 1943. The pest also causes injury to small grains. Rye is damaged considerably in Denmark in some years. The adults feed on the foliage of many plants and are particularly destructive to leaves of fruit trees and occasionally to the young fruit. Distribution: From Britain through central and northern Europe, Russia, Siberia and Tibet. Hosts: Among the many hosts of P. horticola are small grains and grasses, rosaceous fruits, beets, crucifers, beans, peas, flax and forest trees. Life History and Habits: In the English Lake District, the life history of this insect is as follows: Adults appear generally the last week of May, the males one week before the females. Oviposition occurs in the surface of the soil, each egg being placed in an earthen cavity. Incubation averages five weeks. There are three larval instars with the third ending in diapause. Prepupation begins near the end of March and lasts for three or four weeks; pupation begins third week of April and lasts about four weeks. There is only one generation at a time in the soil and the life cycle requires 12 months. The larva feeds on plant roots which it obtains by tunnelling through the soil. The species frequents grassland mainly, especially in wooded areas. Description: Adults about 13 mm. long. Wings shiny red-brown, thorax metallic blue or green, under-surface hairy. Larva is about 20 mm. long and to the unaided eye resembles the Japanese beetle grub
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