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Forages & Grains
Volume 61 Number 9 Date 06/23/2016 POTATO LEAFHOPPER - Counts in second-crop alfalfa remain much the same as previously reported at fewer than 0.6 adults and nymphs per sweep. Most fields are showing low populations of only 0.1-0.3 per sweep. Economic counts of two or more leafhoppers per sweep in alfalfa 12 inches or taller have not been observed as of June 22. ALFALFA WEEVIL -Larval populations are now less than 0.2 per sweep and pupation is occurring across southern and central Wisconsin. No significant alfalfa weevil problems are anticipated for the remainder of the season. PEA APHID -Populations of this insect have continued to decline since the previous report and currently average 0.2 per sweep compared to one per sweep last week. Pea aphid counts have decreased considerably since peaking at 28 per sweep during the last week of May. PLANT BUG -Surveys conducted as far north as Adams, Green Lake and Juneau counties yielded counts of only 0.1-0.8 adults and nymphs per sweep, which is still very low in comparison to the economic threshold of five per sweep in alfalfa. -- Krista Hamilton, DATCP Entomologist 
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