STUDY ON THE IMPORTANT VECTORS OF SOYBEAN MOSAIC VIRUS AND THEIR TRANSMISSION EFFICIENCIES

Guo Jingquan Zhang Minghou (Northeast Agricultural College, Harbin)

SMV, Important vectors, Green-pantraps, Transmission efficiency

Aphis Craccivora and other species also can form small, temporary colonies on seedling soybeans, besides Aphis glycines and Acyrthosi-phon solani can colonize on soybean plant in the field in Harbin, The number and species of flight alate aphids varied with ecological envi-renment changed, but the main flight alate species were basically consistent during tow years. The Green-pantraps trapped alate aphids landing on soybean canopy and some of specimens were identified. The results indicated that, besides the three aphid species as mentioned above, Aphis gossypii, Rhopalosiphum maidis, R. padi, Myzus persicae accounted for the most of alate aphids alighting on soybean, but the number of Aphis glycines was absolutely the most abundant and Acyrthosiphon solani on the contrary. The number of alate aphids on soybean plant considerably correspond to that of alighting on soybean canopy area trapped with the Green-pantraps. The frequency of alate aphids landing on soybean was greatly related to SMV epidemic rate. The 83-02 isolate of SMV transmitted by aphid vectors with acquisition proble of 30-60 sec. were with higher transmission efficiencies, 40-50 sec. the highest. The most vector aphid species of acquisition probes only transmitted the virus to the first plant, but M. persicae to the sec nd plant with 2.94% transmission probability. Under the vec or aphid species transmitted SMV is late 83-02 by singe alate form with optimal acquisition time, the transmissi-n efficiency of A. cra-cciv ra was the highest: 58.33%, M. persicae. 47.66%, A. glycines: 33.33%, Ac. s lani: 23.73%, R. maidis: 12.90%, A. gossypii was the lowest: 4.29% am(?)ng the tested aphid species. The importznt vectors of SMV are A. glycines, but A. craccivora, and M. persicae also have a certain contributi n in spread of SMV.