|
|
|
Looking Ahead
Volume 58 Number 7 Date 06/13/2013 SOYBEAN APHID - Colonization of VC-V1 soybeans was documented for the first time this season on June 4 by UW-Madison researchers in Dane County. DATCP surveys in the last reporting period found aphids at 10 additional sites in Dane, Iowa, Monroe and Richland counties. Densities ranged from 1-30 aphids per infested plant on 1-18% of plants. The relatively early colonization of soybeans this year indicates that crop advisors and growers will need to initiate a regular aphid-scouting program in the next two weeks. EUROPEAN CORN BORER - The peak in moth activity should occur next week in southern and central Wisconsin following the accumulation of 631 degree days (modified base 50°F). Oviposition on vegetable and weed hosts has increased with recent warmer temperatures and larval emergence is beginning in the far south. Since development of this pest is not well synchronized with corn growth this year, most first generation larvae are likely to develop on hosts other than corn. STALK BORER - Migration of larvae from grasses and broadleaf weed hosts into corn is expected to accelerate in the week ahead. Spot treatment may be warranted for fields that show 5-10% of plants with leaf feeding. Damage should become pronounced by late June. BLACK CUTWORM - Larvae from earlier flights of moths that oviposited in cornfields last month are in the damaging late-instar cutting stages. Light injury has been observed in Columbia, Green, Green Lake, Marquette, Rock, Sauk, Waupaca and Waushara counties in the last two weeks, suggesting that corn growers must remain vigilant for signs of cutworm activity. Scouting may be discontinued after the V4 stage. CORN EARWORM - Another significant flight of 154 moths was registered at Janesville from June 6-12. The primary flight ordinarily does not occur until August, but early attention to this species may be in order this season. Routine monitoring of corn and other vegetable such as peas, peppers and cabbage is recommended later this month. -- Krista Hamilton, DATCP Entomologist 
|
|