Reports of western corn rootworm (WCR) larval feeding damage in first-year corn following soybean have primarily occurred in northwestern Indiana and east central Illinois. There is speculation that WCR may be adapting its behavior to the corn/soybean rotation system by laying its eggs in areas that result in the greatest potential for larval survival the following growing season, that being corn following soybean (Edwards et al. 1996). During the summers of 1996 and 1997 experiments were carried out on various farms in Indiana. In the first study, 17 pairs of corn/soybean fields were used. Sampling to determine numbers of WCR adults emerging in corn was accomplished by using emergence traps. The traps were placed in the corn fields, all of which were in soybean the previous year. The data collected in this portion of the study provided important information on egg deposition in soybean fields and on adult emergence the following year in corn fields. The second study was designed to compare counts of WCR adults caught on traps placed in both corn and soybean fields. Pherocon AM® yellow sticky traps were used for trapping adults. In the third study, four trap types (Pherocon AM traps, cone traps, cucurbitacins insecticide-baited vial traps and Olson Yellow Stiky® Cards) were compared to determine the numbers of WCR adults caught for each trap type in soybean and corn. The cone trap was replaced in 1997 by a new WCR attracticide trap which contained cucurbitacins, carbaryl, and paraffin. Results showed that significant numbers of WCR adults emerged from corn fields where soybean was planted the previous year. Results also showed that an adult WCR survey in soybean can potentially be used for predicting larval damage in the following year's corn crop, although the specific economic threshold numbers were not determined in this study. For WCR adult survey in soybean, Pherocon AM traps seem to be the most efficient, although Olson Yellow Stiky Cards have good potential.
|Number of pages||10|
|Journal||Acta Phytopathologica et Entomologica Hungarica|
|Publication status||Published - 1998|
ASJC Scopus subject areas
- Insect Science
- Plant Science