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Note:  Today’s edition is the last regular IPM Update of the season.  We will continue to monitor late season crop pests and will publish updates as necessary.

Sweet Corn
Corn earworm (CEW) moth catches declined dramatically over this past week with evening temperatures dropping into the high 40s in many locations (see CEW blacklight map at left).   In this map, areas in green roughly correspond to a 3-day schedule, while blue areas are in the 4-5 day range.  Blue points within larger green areas should be considered “outliers”, and the broader color scheme in any particular region is more representative of the population. The current situation may change with somewhat warmer night temperatures forecast toward the end of the week.  Should night temperatures begin to approach 60F or more, growers should consider treating remaining silks on a 3-4 rather than a 4-5 day schedule.   Be aware that synthetic pyrethroids have become less effective at managing ear infestations from this pest over the past several years.  For this reason, it is advisable to include products in the IRAC group 28 (Coragen, Besiege) or IRAC group 5 (Radiant, Entrust (OMRI approved)).

The highest nightly CEW blacklight trap catches are as follows:

[Read more…]

Sweet Corn
European corn borer (ECB) catches have again fallen to levels too low to register a map image.  This pest is not much of a threat at this point, with most remaining plantings in silk.  ECB feeding in less mature NJ sweet corn plantings is nearly non-existent now.  Sprays for fall armyworm and corn earworm will manage any ECB larvae at this time.  [Read more…]

Sweet Corn

The arrival of warmer temperatures should improve corn growth considerably.  This same weather could bring on the first consistent European corn borer (ECB) catches, although this has not yet happened.  No ECB were captured in blacklight traps this week.  As the population develops, look for maps to be published in the weekly IPM Update.  There were several corn earworm (CEW) captured in blacklights located in New Egypt, Folsom and Woodstown this past week, however these individuals are of little concern in the absence of silking sweet corn.

Cole Crops

IPM personnel continue to observe infestations of crucifer flea beetle.  These beetles can build to high populations quickly, especially where wild mustard and related cruciferous weeds are common.  Extreme feeding on small transplants can cause irreversible damage if not controlled promptly. [Read more…]

Sweet Corn

Cold temperatures are slowing corn growth considerably.  The same weather is also delaying the onset of pests like the European corn borer (ECB).  No ECB were captured in blacklight traps this week.  As the population develops, look for maps to be published in the weekly IPM Update.

Cole Crops

Although cold weather and heavy rains have suppressed them, IPM personnel continue to observe infestations of crucifer flea beetle.  These beetles can build to high populations quickly, especially where wild mustard and related cruciferous weeds are common.  Extreme feeding on small transplants can cause irreversible damage if not controlled promptly. [Read more…]