none Adding the Gypsy Moth eggs in the first investigation period (Maksimovic, 1978), in little rural groves increased the populations of enemies, which was demonstrated by the number of parasites of young caterpillars of the Gypsy Moth. About 0.2 kg/ha of eggs makes it possible to maintain a continuously low Gypsy Moth population. In the same groves, Savica zabran and Lazarevia lug, the investigations have been continued over the next ten years (1977-1986). The results have corroborated the continuous increase of the enemy populations and maintaining of low numbers of Gypsy Moth populations, considerably lower than in the check grove. In both these test groves as well as in the check grove - Sumorina, the Gypsy Moth numbers had a convergent course. The behaviour of the Gypsy Moth was studied for 3 years after adding of eggs had been stopped. In the first year there were no egg masses on the test plots and also in the two following years in Lazarevic lug, whereas in Savica zabran 2 eggs masses were found in the second year. In the course of the investigations the Gypsy Moth was latent. The eggs masses were of great and medium size and there were 5.8% small ones, whereas in Sumorina there were 12.8% of them. The egg masses were laid on the trunk up to the height of 1 m - 80%, from 1 to 2 m 18.6% and over 2 m of height 1.7%. The presence of Gypsy Moth's enemies was investigated by counting the number of parasite cocoons. Total infestation by the parasites was established in the locality of Savica zabran in 1983, when, in addition the cocoons, were collected also the Gypsy Moth caterpillars, afterwards reared in the insectarium and obtained the parasites, amounted to 92.2%. But 76% of the parasites belonged to the family Braconidae, 15% to tachinids and 1.2% to polyhedry. Of 224 collected cocoons, 10.3% were hyperparasitized. The most numerous species of parasites on young caterpillars is Cotesia melanoscelus and a little less Glyptapenteles portheriae. There was observed also a small number of gregarigenous species which has not been determined. It is suppoosed that was Cotesia ocneriae Ivanov, which in this regions has been determined by Hackett according to March (1979). The number of cocoons which were found varies from year to year and from one grove to another. In the check grove of Sumorina no cocoons were observed. In the first year after the adding of Gypsy Moth eggs was stopped, 22 cocoons were found in Savic zabran in autumn. This indicates that were considerably more numerous at the time of development in 1984. A similar observation was made at Lazarevica lug in 1983, first year after the adding of eggs had been stopped. The correlation course of the dynamics of the Gypsy Moth population in test groves and in the check one shows the effect of exterior factors such as climate.