Feeding Frenzy.
The unprecedented, record-breaking heatwaves and severe drought conditions of summer 2026 created a highly complex scenario for wireworm activity, ultimately increasing the risk of severe damage to winter wheat crops sown in October 2026.
The extreme weather disrupted the pest's usual lifecycle. Now that we have received sufficient rainfall to penetrate to an appreciable depth problems have become apparent.
Induced Dormancy and Delayed Vertical Migration.
Wireworms (the larvae of click beetles) are highly sensitive to heat and moisture. They thrive in cool, damp soils and naturally reject warm, dry conditions.
Summer Behavior.
During the intense drought and heat of May, June, and July wireworms migrated deep into the subsoil seeking refuge in any moisture they could find, they largely ceased to feed.
October and wheat planting.
Wireworms did not die in the summer drought; instead, they waited it out. As cooler temperatures and seasonal moisture returned, wireworms migrated back to the top layers of soil to initiate an intense "feeding frenzy". Wheat crops are emerging exactly as these hungry larvae return to the surface.
Attraction.
Germinating wheat seeds naturally emit carbon dioxide (CO2), which is the primary homing mechanism wireworms use to locate food. Because the extreme summer delayed their feeding cycles, the returning larvae are highly active and aggressively drawn to the CO2 plumes of newly germinated seedlings.
Compromised Plant Resilience.
Starting off in dry soil, October-sown wheat began its life growing more slowly than usual and consequently is in a way more vulnerable to attack.
Random damage.
Unlike straight lines caused by drilling errors, wireworm damage shows as erratic, random bare patches across fields.
Digging plants up reveals the telltale symptoms of attack, including shredded stems at the base of cereal plants, un-emerged seeds that have been entirely hollowed out, and rapid wilting of young central leaves.
Given that wireworms can live in the soil for 3 to 5 years, the summer of 2026 did not diminish the overarching pest population; it merely compressed their feeding window right into the critical germination phase of this autumn's wheat crop.
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