S. Mahunka szerk.: Folia Entomologica Hungarica 46/2. (Budapest, 1985)

two weeks until they died. The leaves were examined under dissecting microscope and those containing eggs were saved. Since eggs deposited in the plant tissue, the total number of eggs laid per female wad determined indirectly by counting the number of nymphs that emerged. The average number that hatched from eggs deposited by 10 females was 180 and 200 for S. aemulans and S. marginatus respectively. It is worth to metion that the winter is apparently spent in the egg stage, since nymphs were always the first instar to appear in the spring and adults were not observed until the mid of May. Laboratory rearing confirmed the findings of HEGAB and JENSER (1982) who showed that S. aemulans has two generations in a year. Table 1. Duration of egg and nymphal stages of Streptanus species on healthy and infected host seedlings with plant pathogenic mycoplasmas The average duration of egg and _ , . . . , , . . ~_. Total nymphal Total egg and nymphal nymphal stages (days) , . . ,, , Host stage (days) stage (days) Egg stage 1st 2nd 3rd 4th 5th Females of S. aemulans reared on healthy host seedlings Apple 14 6 6 5 6 5 28 42 Apricot 13 6 6 5 5 5 27 40 Strawberry 13 5 5 5 5 5 25 38 Clover 11 5 5 5 5 4 24 35 Celery 9 5 S 5 4 4 23 32 Females of S. aemulans reared on infected host seedlings Apple infected 12 5 5 5 5 5 28 37 with A.P. Apricot infected 11 5 5 5 5 5 25 36 with Ch. L.R. Strawberry infected 10 5 5 5 4 4 23 33 with G.P. Clover infected 9 5 4 4 4 4 21 30 with G.P. Celery infected 8 4 4 4 4 3 18 27 with A. P. Celery infected 8 4 4 3 4 3 18 26 with G.P. Males of S. aemulans reared on healthy host seedlings Apple 14 6 5 5 5 4 25 39 Apricot 14 6 5 5 4 4 24 38 Strawberry 13 6 5 5 4 4 24 37 Clover 11 6 5 5 4 4 24 35 Celery 10 5 5 5 4 4 23 33