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Looking Ahead

Forages & Grains

Corn

Soybeans

Fruits

Vegetables

Nursery & Forest

Degree Days

Looking Ahead
Volume 60 Number 15 Date 07/30/2015


EUROPEAN CORN BORER - The treatment window for second-generation larvae has opened in southern and western Wisconsin with the accumulation of 1,550 degree days (modified base 50°F). Susceptible corn should be inspected next week for egg masses and small larvae. Chemical control directed against early-instar corn borers will remain an option until 2,100 degree days have been surpassed, or for approximately three weeks under normal August temperatures.

WESTERN BEAN CUTWORM - Moth counts peaked from July 23-29 at most southern and central monitoring sites. The cumulative state total as of July 29 is only 275 moths in 97 pheromone traps, the lowest count recorded in the last 11 years. Preliminary results of the 2015 wbcw trapping survey are summarized in the map on page 100.

SOYBEAN APHID - Monitoring efforts should be increased in all areas of the state as more fields enter the pod-setting stages. DATCP surveys continue to find low average densities of less than 25 aphids per plant, but a few isolated fields could develop economic populations early next month. Foliar treatment is not recommended until soybean fields have been thoroughly sampled to determine if the established threshold of 250 aphids per plant on 80% of the plants has been exceeded.

JAPANESE BEETLE - Reports indicate that these beetles are abundant enough in some apple orchards and nurseries to require treatment. Continued scouting is advised in August for apples, corn, grapes, soybeans, and all other susceptible crops. Economic thresholds vary by crop and are listed in the CORN , SOYBEAN and FRUIT sections.

CORN EARWORM - Migrants arrived in very low numbers for the fourth week. The monthly total count of only 47 moths at 10 pheromone trap locations indicates a low risk of earworm infestation for now, but monitoring network participants should continue to scout silking fields and replace lures on a weekly basis.

-- Krista Hamilton, DATCP Entomologist