A River Runs Through It
Through this field west of Goshen anyway. The recent rains this week have put a bit of a hurting on fields with heavy soils. Ponding occurs when crops are in standing water. Plants can survive about 4 days underwater, but plant vigor and yield can be effected much sooner. Younger plants are more susceptible to damage than older plants. Were water runs soil erosion can unearth the roots system and cause future lodging.
As promised last week, here is scouting information on European Corn Borer. First identify damage, which for first generation is feeding on the leaves of the corn, so that you know what you’re looking for.
As the worms tunnel through the whorl a series of holes are left behind and show up as “bullet holes” as the leaves unroll.
Another tell-tale sign of European Corn Borer is their “frass” on the stalk or on the leaves (this is the results of all their eating!).
Then count off 25 plants and determine how many have damage. In this example I found 1 plant with damage, so 1 out of 25 had damage, or 4%.
Choose one plant with damage and pull out the whorl (the center of the plant) – grasp the whorl and pull straight up. Carefully unroll the leaves, looking for worms. They are quite small this time of year, so be very watchful!
The threshold for treatment in non-Bt commercial corn 56-60% as long the worms are still in the whorl. As the worms mature they tunnel into stalk, where insecticides are no longer effective. In seed corn treatment may be justified at 15-20% damage.
Keep a lookout for diseases, as they are starting to show up in the area with the wet weather. Stay tuned for more information!
Edd’s Supplies has two fungicide injection pumps available to customers who would like to apply fungicides to crops. Call the office for more information.
Thanks for scouting with us : )
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