|
|
|
Soybeans
Volume 57 Number 10 Date 06/14/2012 SOYBEAN APHID - Small colonies are appearing in a greater percentage of soybean fields and have been detected thus far in Columbia, Dane, La Crosse, Manitowoc, Marquette and Sheboygan counties. Densities remain below 5 aphids per plant and 9 per infested plant based on examination of 100 plants per field. BEAN LEAF BEETLE - Defoliation ranging from 5-15% was noted on 25-50% of plants in several fields checked in Columbia, Dane, Grant, Green and Juneau counties. Despite widespread feeding injury, very few beetles could be found and treatment was not warranted. Treatment should be considered only for infestations of 39 beetles per foot of row or defoliation in excess of 40% per plant throughout the field. VARIEGATED CUTWORM - Larvae are reportedly causing light to moderate defoliation of soybeans in Fond du Lac County. Economic damage has not been observed or reported thus far. Defoliation levels must reach or exceed the 40% economic threshold for fields to qualify for treatment. --Krista Hamilton, DATCP Entomologist 
|
|