Bug Scout 1981
Planting Dates Affect Insect Population
(Tom Turpin, Entomologist, Purdue University)
Offhand I'd say the oak leaf and the squirrel's ear are about the same size.
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April 18, 1981

'Tis the season to plant corn.  Dates of corn planting can influence insect populations.  It may also affect performance of insecticides.  For instance, the earlier a soil insecticide is applied, the more likely it will disappear before rootworm larvae hatch.

In general, the earliest-planted corn will have more first-brood European cornborers and corn rootworm larvae than later planting.  On the other hand, the latest-planted corn in an area will probably have a higher risk of second-brood cornborers.  Rootworm beetles frequently concentrate in the latest-silking corn fields and can then interfere with pollination.

Hardly anyone still waits until the oak leaf is the size of a squirrel's ear to plant corn.  Therefore, be alert to increased rootworm pressure and poorer insecticide performance because of the earlier planting dates.  
    

by Tom Turpin, Entomologist, Purdue University

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