A Multivirus Epidemic of Tomatoes in Alabama.

摘要: During 1992, a multivirus epidemic reduced tomato production by as much 25% in the major tomato-growing region of Alabama. Estimated yield losses 100% resulted from over 250 ha two counties North Cucumber mosaic cucumovirus (CMV), alone or combination with potato potyvirus Y (PVY) and/or tobacco etch (TEV), was responsible for crop failure. CMV detected PVY TEV 70% samples tested and present 90% fields surveyed. In 1993, 21 were monitored weekly transplanting through harvest CMV, PVY, TEV, tobamovirus, spotted wilt tospovirus. All 5 viruses detected, occurring most frequently. Incidence at 61% level higher found 16 Tomatoes transplanted April May least effected had relatively low virus incidence until late their development. June July infected an earlier age, highest incidence, severely affected, suffered greatest loss yield. 1994,Aphis gossypii, cotton aphid, common vector during aphid monitoring/virus spread study. Populations A. gossypii peaked June, immediately preceding period rapid spread.