|Elliott, Norman - Norm|
Submitted to: Extension Fact Sheets
Publication Type: Popular publication
Publication Acceptance Date: 3/31/2002
Publication Date: 6/1/2002
Citation: ROYER, T.A., GILES, K.L., ELLIOTT, N.C. GLANCE N' GO SAMPLING FOR GREENBUGS IN WINTER WHEAT: SPRING EDITION. 2002. OKLAHOMA COOPERATIVE EXTENSION SERVICE, EXTENSION FACT SHEETS. L-306. Interpretive Summary:
Technical Abstract: A reusable chart for Glance 'n Go sampling was developed for spring (January-May) greenbug infestations in winter wheat. Sampling fields for greenbugs using the chart will save farmers money because insecticide treatment will only be recommended if needed to protect the wheat crop from economic losses. The Glance 'N Go greenbug sampling method involves walking a zig-zag or "W" pattern through a wheat field and carefully pulling and examining two tillers per stop along the way. A cumulative total of the number of tillers infested with greenbugs is kept. The user compares the count of greenbug-infested tillers to the corresponding numbers listed in the lower and upper limit columns in the decision grid. The user continues sampling until a decision is made or until 100 tillers are sampled. The chart is designed for use from January-May greenbug infestations and the data behind it is well documented with research on greenbug populations in the colder months of the year. The Glance 'n Go sampling system is based on Oklahoma research in over 100 wheat fields and gives growers the ability to account for the price of wheat and the cost of applying insecticide in their decision making. The probabilities of this chart are conservative in the sense that errors will result in treating fields that, although very close to the threshold, might not need to be treated. However, this type of error is generally preferable to the alternative of not treating fields that slightly exceed the economic threshold.