CONTROL OF GRAPE COLASPIS AND RICE WATER WEEVIL BY SELECTED SEED TREATMENTS IN ARKANSAS RICE
Proposed by: Craig S.Allen
Presenters: Allen, C.S., Cea - Agri, University Of Arkansas, Cooperative Extension Service, Harrisburg, AR 72432
Colwell, K, Research Associate, University Of Arkansas, Cooperative Extension Service, Lonoke, AR 72086
Lorenz, G, Extension Entomologist, University Of Arkansas, Cooperative Extension Service, Lonoke, AR 72086
Wilf, H, Research Associate, University Of Arkansas, Cooperative Extension Service, Lonoke, AR 72086
With the loss of Icon Seed treatment for use in rice, farmers have had few options for control of two of the major pests in Arkansas rice culture. It has been a struggle for rice producers in Poinsett County and surrounding areas to deal with grape colaspis and rice water weevil. Grape colaspis is especially detrimental to rice seedlings and causes stand loss especially under adverse environmental conditions. The larvae stage of these insects feed on the plants causing root pruning and girdling resulting in plant death. In conjunction with the Extension Entomologist a protocol was developed for on-farm testing to evaluate the efficacy of three new seed treatments aimed at controlling these two pests. Replicated trials were established in grower fields in Poinsett County during the 2008 and 2009 growing seasons. These fields had a history of reduced stands and yield loss caused by these pests. The three seed treatments evaluated were Dermacor, Cruiser and Nipsit Inside. University of Arkansas recommendations for fertility and crop management were utilized in all trials. Control ratings were taken at standardized timings. Results of these studies indicated differences among treatments, including increased stand counts, plant height and enhanced seedling vigor. Core samples indicated a reduction in insect numbers. Yield increases of 8-10 bushels per acre were also common. Further results of these studies will be presented to fellow agents and producers.