S. Mahunka szerk.: Folia Entomologica Hungarica 45/1. (Budapest, 1984)

ROVARTANI KÖZLEMÉNYEK XLV. 1 1984 p. 19.25 The morphology of Brachycaudus helichrysi (Kalt) (Homoptera: Aphididae) on plum trees in Hungary By E. T. E. DARWISH (Received 1 July, 1983) Abstract: Five distinct morphological forms (fundatrix, apterous viviparous female, alate viviparous female, apterous oviparous female, alate male) and larval stages of Brachycaudus helichrysi (Kalt.) were studied and described. The present work was carried out in the Hungarian Natural History Museum, Budapest with the object of adding new information to our available knowledge on the plum leaf curling aphid B

. helichrysi (Kalt.). The aphids were collected in 1982, by the author from Nagykovácsi during the biological and ecological studies of this aphid under field conditions. This aphid is considered to be one of the most injurious pests on plum trees in Hungary, and occurs wherever plum is grown (BATRA 1953; KARCZEWSKA 1975; KOLESOVA 1976; DICKER 1979). The morphology of all morphs and immature stages is described. STROYAN (1952) gave a short description to apterous and alate viviparous females. Material and Methods Specimens were found in large numbers in Nagykovácsi orchard on plum trees during April May and September-October, 1982. The aphids were collected in the field with the plant which was then taken to the laboratory, where specimens were transferred into 70 % ethyl alcohol. For maceration the method mentioned by Hille Ris LAMBERS (1951) and explained by Van EMDEN (1972) was used. The specimens were mounted in Berlese'

s fluid. Measurements of 10 individuals from each morph and each instar were taken, and the mean of the ten measurements are given with the standard error. Descriptions of different morphs and larval Instars Fundatrix: In life and as mounted specimens much like apterous viviparous females.Compound eyes consisting of about 44-58 ommatidia. Antennae only 0.39-0.45 times the length of body; processus terminális 0.69-1.30 times the length of joint III, and 2.0-3.2 times as long as basal part