Presentation on theme: "Detection and Monitoring of Stored-Grain Insects Bh. Subramanyam, Carl Reed, and Phil Sloderbeck* Department of Grain Science and Industry *Department."— Presentation transcript:
Detection and Monitoring of Stored-Grain Insects Bh. Subramanyam, Carl Reed, and Phil Sloderbeck* Department of Grain Science and Industry *Department of Entomology Kansas State University Manhattan, KS Grain Handlers Workshop
Detection Looking for presence or absence of an insect or an infestation (with respect to your sampling device) The type of device used and the number of samples taken determine how good you are in finding an insect or an infestation
Monitoring Tracking trends in insect numbers or infestation levels over time Helps you know when to take action Helps you understand how populations are behaving with respect to environmental conditions Helps you assess effectiveness of pest management actions
Detection and Monitoring Require Sampling Counting all insects in a bin is difficult Their distribution is unknown It may take forever to count all insects present Time and money are limited Sampling will help in making inferences about the insects inhabiting a bin or silo
Infestation in Railcars Wheat 21, 3 kg wheat samples/railcar were taken from 8 railcars (Perez-Mendoza et al., 2004) They also had a lot of IDK 1024 insects were found in 7 of 8 railcars 3% of insects were found immediately after sample collection 77.1% were found 7 weeks after sample incubation Relevance to detection?? Relevance to fumigant efficacy??
In Concrete Elevators High insect density is within the top 3-4 ft and all of the insects can be found within 40 ft from the top Discharge from spouts onto reclaim belt had more insects than grain samples taken with a vacuum probe Fewer insects were found in treated empty bins and the treatment effectiveness lasted 12 weeks Relevance: Understand where to sample!
Relative Estimates Are….. Faster, cheaper, and easier than absolute methods Traps work 24 hours a day, 7 days a week Interpretation of numbers is difficult (biological and environmental variable affect insect captures) Can be used to pin point problem areas Can be used to evaluate effectiveness of pest management measures
Take Home Points Be a truck, railcar, bin, or elevator silo Take more samples than fewer samples More than 10 and less than 30 Information from sampling can be used in 2 computer programs (SGA and SGA Pro) to make pest management decisions Without proper detection and monitoring of insects you will treating more number of times than needed or fail to treat when you really need to!