damage level 第1页

The synchronization of ear emerging stages of winter wheat with occurrent periods of the orange wheat blossom midge, Sitodiplosismosellana (Gehin) (Diptera: Cecidomyiidae) adults and its damaged level RELATIONSHIP BETWEEN THE ECOLOGICAL FACTORS AND THE DAMAGE LEVEL OF PINUS MASSONIANA FOREST ATTACKED BY HEMIBERLESIA PITYSOPHILA STUDIES ON THE DEGREE OF INJURY BY ZOKER AND ECONOMIC THRESHOLD OF ITS CONTROL