home Susbcribe About Us Contacts Past Issues Print this issue


Looking Ahead

Forages & Grains

Corn

Soybeans

Fruits

Vegetables

Nursery & Forest

Degree Days

Forages & Grains
Volume 61 Number 12 Date 07/21/2016


POTATO LEAFHOPPER - Counts remain low or moderate. Alfalfa fields surveyed in Chippewa, Dunn, Jackson, Monroe and Vernon counties in western Wisconsin showed 0.2-0.8 adults and nymphs per sweep, with an average of only 0.4 per sweep. Counts in surveyed fields in Columbia, Dane, Dodge, Fond du Lac and Green counties were generally lower and ranged from 0.1-0.3 per sweep. The relatively high proportion of fields with nymphs indicates reproduction is occurring and damaging populations could develop in fourth-crop alfalfa next month.

PEA APHID - Levels of this insect are increasing in some alfalfa fields after declining for seven weeks. Scattered fields now have counts of 3-5 aphids per sweep. The July 14-20 average of 1.4 per sweep compares to 0.3 per sweep the week before.

PLANT BUG - Mixed populations of alfalfa and tarnished plant bugs currently average 0.5 per sweep across the lower two-thirds of the state, with a range of 0-1.2 per sweep. The week's highest count was recorded in Jackson County. Nymphs are generally more abundant than adults at this time.

ALFALFA CATERPILLAR - Larvae are common in field collections, especially in south-central and west-central alfalfa fields where counts occasionally exceed one per sweep. Adults were also observed in high numbers in fields near the Mississippi River in Trempealeau, Buffalo and Pepin counties.

-- Krista Hamilton, DATCP Entomologist