1a. Objectives (from AD-416)
Develop integrated pest management of the potato psyllid and Liberibacter in a multicrop system (potato, tomato, and pepper).
1b. Approach (from AD-416)
Conduct insect transmission studies under laboratory conditions to determine Liberibacter acquisition and inoculation access time required for the potato psyllid to effectively transmit the bacterium and induce diseases. Determine the impact of Liberibacter on different plant growth stages under controlled field cage conditions. Determine density of potato psyllid required for this insect pest to effectively cause diseases in potato, tomato, and pepper. Documents Trust agreement with University of California, Riverside (CSREES RAMP). Log 39329.
3. Progress Report
The project goal is to develop effective management strategies for potato psyllid and zebra chip disease. The potato psyllid has recently become a major concern because of its direct feeding and vectoring of diseases caused by the bacterium Liberibacter to potato, tomato, and pepper crops in U.S. and other countries. The main objective of this research is to develop integrated pest management of the potato psyllid and liberibacter in a multicrop system that includes potato, tomato, and pepper. The following research was conducted: 1) in the laboratory, we determined liberibacter acquisition and inoculation access time required for the potato psyllid to effectively transmit the bacterium to potato, tomato, and pepper and induce diseases in these plant crops; 2) determined the impact of liberibacter on different plant growth stages of potato, tomato, and pepper under controlled field cage conditions; and 3) determined the density of potato psyllids required for this insect pest to cause zebra chip disease in potato, tomato, and pepper. Preliminary results indicate that the potato psyllid can acquire and transmit the bacterium in a time as short as 2 hours. Also, as few as one liberibacter-infective potato psyllid per plant is enough to effectively cause zebra chip potato disease and significant yield loss. This work addresses objective 3 of the project plan. Monitoring of activities and progress on this project was accomplished by direct supervision of on-site employees, and use of site visits, e-mail and telephone to communicate with off-site collaborators.