Sweet Corn
IPM personnel have deployed black light and corn earworm (CEW) pheromone trap networks in central and northern New Jersey counties. As we start our summer field technicians, trap checks are limited. However, even with cool weather and few traps visited, there have been low catches of CEW in several pheromone traps. While this is of little consequence now, it does suggest that local overwintering is a possibility. We have experienced increasing CEW populations in recent years at the time our early plantings silk (mid-June), and the presence of moths in early May points to more of the same this year.
Black light trap derived maps for European corn borer (ECB), CEW and brown marmorated stink bug (BMSB) will not appear in the Plant and Pest Advisory, as there is no statewide blacklight trap network. Data from existing black lights in the central and northern counties will appear in table format, with associated information on the relevance of the populations. Provided that data from the southern CEW pheromone traps is available on a regular basis, maps will be generated for this pest/trap type. Limited collections from traps thus far have not contained any target pests.
Slugs
With recent cool wet weather, slug damage (photo at left, by J. Compton) to various crops, including sweet corn has begun to appear. No till or zone till situations give slugs ample hiding places under the surface layer of debris. Plastic mulch can also protect slugs as long as weather remains cool. They are largely active at night but can be found on crop plants anytime conditions are very wet. Most slugs are not as large as the specimen in the picture at right, but even small garden slugs can do significant damage to seedlings. Be sure to monitor fields during wet and cool conditions. The presence of slugs and their damage may require an application of slug bait to the affected areas. Various slug baits are available, but labels should be consulted to determine which product is permissible on the affected crop. Check the Pest Management section in the 2024 Commercial Vegetable Production Guide for products.