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  How to Manage Pests>Corn>

 

Insect Thresholds of Corn

Pest Threshold Reference
wbeancutworm.jpg (3465 bytes)

western bean cutworm

     field corn

     sweet corn

 

1 plant in 7 with egg masses or injury

1 plant in 20 with egg masses or injury

UI CIS 302 (1993)

wcornrootworm.jpg (3442 bytes)

western corn rootworm

     seed corn

 

     sweet corn

 

 

 

 

2 beetles per plant and less than half of plants have been pollinated

5 beetles per plant and less than half of plants have been pollinated

Treat field NEXT YEAR at planting for larval control if infestation averages 1 beetle per plant THIS YEAR and field will be planted in corn

UI CIS 924 (1992)

Thresholds are not available for these pests: corn earworm; corn leaf aphid; cutworms, -army cutworm, -black cutworm, -redbacked cutworm, -spotted cutworm, -variegated cutworm, -western yellowstriped armyworm; earwig; garden symphylan; grasshoppers/crickets; oat bird-cherry aphid; seedcorn maggot; slugs; two-spotted spider mite; white grubs; wireworm.

References:  UI CIS 302 Western bean cutworm on beans and corn, UI CIS 924 Western corn rootworm.

Revised: August 12, 2008

 
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