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Looking Ahead
Volume 65 Number 2 Date 05/07/2020 BLACK CUTWORM - Migrants arrived in moderate numbers during the week of April 30-May 6. Survey traps collected a total of 198 moths at 44 sites, and the first significant captures of nine moths in two nights were recorded at three monitoring locations in Grant, Green and Lafayette counties. Based on the first major BCW migration event on May 4 and the expected slow accumulation of degree days in the next week, the peak seedling corn damage period will not open until June 3 in far southern Wisconsin. The early start to the 2020 planting season and the relatively small moth migration documented since mid-April indicate a low black cutworm threat to vegetative corn this spring. COMMON ASPARAGUS BEETLE - Emergence of overwintered adults is expected to begin by May 19 in the Beloit, La Crosse, Madison and Platteville areas. Scouting for the bluish-black beetles with cream-colored spots is recommended just after asparagus plants emerge, or as 150 degree days (simple base 50°F) are reached. The ideal time to look for the beetles is in the afternoon when they are most active. Optimal control of this pest requires scouting and hand-picking the adults early in the season to prevent egg laying. SEEDCORN MAGGOT - Peak fly emergence occurred last week across southern Wisconsin as 360 degree days (sine base 39°F) were surpassed, and is forecast for the Appleton, Hancock and Tomah areas of central Wisconsin in the week ahead. If seedcorn maggot infestation is suspected, digging up apparent seed skips in the row and examining seeds for evidence of damage is advised. GYPSY MOTH - Larval emergence from overwintered egg masses on was noted on May 2 in Dane County. Phenological indicators that coincide with this early spring event include beginning bloom of eastern redbud and saucer cup magnolia petal fall. Egg hatch is anticipated next week in central Wisconsin. LILY LEAF BEETLE - This newly established invasive lily pest has been confirmed in Vernon County. The distinctive red beetles were identified by UW-Madison Entomologist PJ Liesch on May 1 from a photo submitted to his Insect Diagnostic Lab. Lily leaf beetle was detected in six new counties last season and, with the addition of Vernon County, has now been confirmed in 13 Wisconsin counties. Gardeners and homeowners are asked to be on the lookout for the invasive red lily leaf beetle (LLB) this spring and to take measures to prevent it from spreading. -- Krista Hamilton, DATCP Entomologist .jpg)
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