Nifontov S.V., Gridnev A.N., Savchenko A.A.
Agrarian newsletter of Primoriye 2018; (1(9)): 58-60
Annually pests have a significant impact on the condition of coniferous forests of the Far East, among which the most dangerous is the Siberian silkworm (Dendrolimus superans sibiricus Tschetv.). This phytophagus as a fodder base prefers such tree species as Korean pine and East Siberian fir. In addition, in the Khabarovsk territory the larch strain of the Siberian silkworm, which damages larch stands, is spread. The insect brings the greatest harm with mass reproduction (outbreak), which depends on many factors of a biotic and abiotic nature. The most favorable abiotic factor in the mass reproduction of the Siberian silkworm is warm dry weather. In the case of an outbreak of mass reproduction, such conditions allow the phytophage to pass from a two-year cycle to a one-year cycle. With a one-year development, the second year is out of the scheme, when the silkworm is in the stage of the caterpillar during the whole vegetative period. As a result, the butterflies of both generations appear simultaneously, which promotes the formation of an outbreak. The success of the fight against this pest largely depends on the outbreak estimation, within the framework of state forest pathological monitoring.
