S. Mahunka szerk.: Folia Entomologica Hungarica 43/1. (Budapest, 1982)

Maximal weights of the faeces that accumulated in mines were 2.2 mg (1977) and 1.9 mg (1979). Comparing the quantities of faeces and consumption we find that nutrient utilization in 1977 was essentially worse than in 1979. As a result of the great quantity of rainfall in autumn, most of the faeces that has accumulated in the mines, melts away after defoliation from the mines that are gnawn or torn out and serves as easily available nutrient for the plants at the beginning of the following year. Taking Into account that the decomposition of a quantity of consumed leaves equal to that of the faeces would be much slower if it were in litter form, we can conclude that matter circulation is remarkably accelerated through faeces. D R9Í: FU% 100 su 60 40 20 n = 6 21 13 I: 0,014 0, 050 0,060 0, 100) 0. 140 0,224 mean dry weight of individuals (mg) Fig. 2. Ecological capacity values expressed in dry weight for Antispila treitschkeella F.R. until reaching a given weight. (Average values for the years of 1978 and 1980) C -FU P A% = assimilatory capacity = — x 100 P% = production capacity = — x 100 = respiratory capacity c xl0

° FU FU% = excretion index = —— x 100 Summary In the Sikfokut Project sample area in the autumn of 1977 we observed an outbreak of Anti spila treitschkeella F.R. larvae in the leaves of the shrub Cornus mas. During the time of our surveys we found that the values of maximal counts were increasing in the years of 1977-1979 (10.84, 18.20 and 34.41 x 10 ind. ha ). It also meant a significant increase in the biomass of this species in the forest (1.86, 1.66 and 4.65 kg ha-1 in dry weight).