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Looking Ahead

Forages & Grains

Corn

Soybeans

Fruits

Vegetables

Nursery & Forest

Degree Days

Looking Ahead
Volume 64 Number 8 Date 06/20/2019


TRUE ARMYWORM - First-generation armyworm caterpillars are appearing in the perimeter rows of corn. Surveys indicate larval populations in corn remain below economically significant levels for now, but the very large moth captures of 491-1,110 moths registered in black light traps during the previous four weeks indicate that armyworm larvae may be locally abundant. Continued weekly scouting of corn and wheat is strongly recommended.

SPOTTED WING DROSOPHILA - The first reported female SWD fly of the season was captured in a DATCP monitoring trap between June 13 and 19. The appearance of SWD adults should be viewed as a warning to fruit growers to increase monitoring efforts since fly populations typically surge rapidly within three weeks of initial trap captures.

EUROPEAN CORN BORER - The spring flight continued for the third consecutive week and is expected to peak by June 20 in the south-central and southwestern counties, June 25 in the southeastern and central areas, and June 30 in the north. Moths are appearing in low numbers in black light trap and egg laying is underway throughout much of the state.

WESTERN BEAN CUTWORM - Pheromone traps are now being set in preparation for the annual moth flight. Participants in the western bean cutworm monitoring program should begin reporting counts to Tracy Schilder at tracy.schilder@wisconsin.gov by June 26 and each Wednesday during the nine-week trapping survey.

CODLING MOTH - Most southern and central Wisconsin apple orchards are 200-300 degree days (modified base 50°F) beyond the spring biofix, and treatments for first-generation larvae are beginning. Reapplication of CM insecticides may be necessary if heavy rainfall of two or more inches is received and trap counts are consistently above five moths per trap per week, or following a brief intense rain event (½-1 inch). Scouting fruits for tiny, circular entry wounds should start next week.

STALK BORER - Migration of stalk borer larvae from grasses and broadleaf weed hosts into corn is expected to increase next week. Spot treatment may be warranted for fields that show 5% of plants with leaf feeding. Damage should become pronounced by late June or early July.

EASTERN TENT CATERPILLAR - Pupation has started in advanced areas of southern Wisconsin with the accumulation of 725 degree days (base 50°F). The first moths should begin emerging in 1-2 weeks.

-- Krista Hamilton, DATCP Entomologist