Aukshtikalnene, A.M., 1979.
Competitive interaction between the pests of common pine. Noveishie dostizheniya lesnoi entomologii, 136-138.
Abstract
Observations were carried out in 1973-79 in park plantations around Lake Issyk-Kul in the Kirgiz SSR, USSR, on the competitive interactions between pests of common pine [Pinus sylvestris]. The 2 most important pest species were Pineus pini (Gmel.), Oligonychus piceae (Reck), which occupied the same ecological niche. P. pini was the more recent of the 2 pests, displacing O. piceae. P. pini responded to the overpopulation of the biocoenosis by an increase in the numbers of winged migrant females and decreases in the numbers of eggs laid by fundatrices and colonising females. The food-plant range of the aphid also increased during the period of mass multiplication. O. piceae responded by a 2-3-fold reduction in fecundity, a near doubling of the number of males and mass mortality of newly hatched larvae. During the period when the population of P. pini reached a peak, that of O. piceae was at a minimum. Natural enemies did not play an important role during the first 3 years of the study, they reduced the population of P. pini only after mass reproduction of specialised entomophages, especially Leucopis spp. When the population of P. pini had been reduced sufficiently, numbers of O. piceae began to increase again
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