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Looking Ahead

Forages & Grains

Corn

Soybeans

Fruits

Vegetables

Nursery & Forest

Degree Days

Looking Ahead
Volume 61 Number 9 Date 06/23/2016


APPLE MAGGOT - Degree day accumulations in southern and western Wisconsin are appropriate for fly emergence. Red sphere and yellow sticky traps should be placed next week in perimeter trees adjacent to abandoned orchards or woodlots to capture the earliest emerging flies. The treatment threshold for apple maggot remains at five flies per trap per week for traps enhanced with ammonia attractant and one fly per trap per week for unbaited traps.

EUROPEAN CORN BORER - Larvae are primarily in the first to third instars and will begin entering the midribs of corn leaves next week. The treatment window for first-generation corn borers is expected to close by June 28 in the far southern counties and 1-2 weeks later elsewhere, following the accumulation of 1,100 degree days (modified base 50°F).

WESTERN BEAN CUTWORM - Pheromone traps are now being set in preparation for the annual moth flight. Participants in the western bean cutworm monitoring program are reminded to report counts to Tracy Schilder at tracy.schilder@wisconsin.gov by June 29 and each Wednesday through mid-August. The first moths of the season could start appearing in traps during the last week of June.

SOYBEAN APHID - Counts remain extremely low in most soybean fields. Of the 36 sites surveyed from June 16-22, nine had averages below two aphids per plant and 75% of the fields had no detectable aphid population. Routine monitoring for aphids should begin by early July.

JAPANESE BEETLE - Emergence of Japanese beetles has been observed in Columbia, Dane, La Crosse, Racine and Rock counties as of June 23. Damage to fruit trees, ornamentals, nursery stock and field crops can be expected for the next two months across most of the state, with heaviest populations likely occurring in the western areas where the beetle's range is expanding. Soil-applied systemic insecticide treatments must be made 3-4 weeks in advance of beetle emergence and are no longer advised for southern and central Wisconsin.

-- Krista Hamilton, DATCP Entomologist