New Reference Guide Helps Producers Assess If and When to Use Neonicotinoid Seed Treatments
by Christian Krupke,
Soybean Entomologist, Purdue University
Treated seed before soil covering
seed treatments offer soybean plants a narrow window of protection — a
maximum of three weeks after planting. As such, they can be useful for
managing early-season pests in targeted, high-risk situations.
high-risk scenarios are uncommon in northern states, however, and early-season
pests such as wireworms, white grubs, seedcorn maggots, and adult bean leaf
beetles rarely reach economically damaging levels. Recent field
studies support this point: yield benefits attributed to neonicotinoid seed
treatments are often inconsistent or absent.
results and more are outlined in The Effectiveness of Neonicotinoid Seed Treatments in
a new resource guide for soybean producers. Co-authored by 17
entomologists representing 12 universities, the guide aims to provide the information soybean producers need to make the best possible
decisions about the use of these products under their particular field
conditions. The guide summarizes recent research on both the pros and cons of this approach to pest management in
soybean aphid is the most important insect pest of soybean in northern states,
and it is listed on labels for neonicotinoid seed treatments. However,
soybean aphid populations usually increase in midsummer during the
late-vegetative and bloom stages of soybean.There is little or no insecticide
remaining in soybean plants by the time soybean aphid populations typically
begin to increase, making neonicotinoid seed treatments a poor fit for the most
common pest growers encounter in the north-central region.
frequently face limited choices regarding seed treatments. Popular soybean
varieties are often offered only with a pre-applied package of seed
treatments. Growers who desire untreated soybean seed, or seed
treated only with fungicides, should let their seed dealers know as early as
possible when ordering seed for the next growing season.
your free copy of The
Effectiveness of Neonicotinoid Seed Treatments in Soybean
Purdue University Education Store.