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Soybeans
Volume 63 Number 8 Date 06/21/2018 SOYBEAN APHID - Early colonies have been found in soybeans south of La Crosse County since June 4. Counts remain extremely low in most fields. Of the 25 sites surveyed from June 14-20, five had averages below one aphid per plant and 80% of the fields had no detectable aphid population. Routine monitoring for aphids should begin by early July. ROSE CHAFER - This insect is common this season, and light damage is noticeable in soybean fields on sandy soils in the southern two-thirds of the state. Defoliation levels have not exceeded the 30% threshold for pre-bloom soybeans in any field checked by DATCP as of June 21. SAND CHAFER - Low to moderate populations were encountered in soybeans and corn near Trempealeau on June 18. The adult beetles, notable for their similarity to Japanese beetles and for an attraction to light-colored clothing, are not known to cause economic damage to crops, though damage by the immature grubs to potato tubers has been reported. Only minor leaf feeding was observed in the soybean fields with significant numbers of chafers. -- Krista Hamilton, DATCP Entomologist 
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