Abstract: A laboratory experiment was conducted to study the effects of breeding with the Pinus tabuliformis needles from different stand types on the growth and development of Dendrolimus tabulaeformis with differentcolored morphs. Compared with yellow morph larvae, black morph larvae had the characteristics of fast body weight growth, heavier female pupa, larger fertility, and higher survival rate. Breeding with the P. tabuliformis needles from mixed stand prolonged the larvae development duration and restrained the larvae growth and development, as compared to the breeding with the needles from pure stand. It was suggested that the P. tabuliformis needles from mixed stand could contain unfavorable substances for the development of D. tabulaeformis larvae.

Key words: sub-low temperature, melon, melatonin, nitrogen metabolism, osmotic adjustment substance.