Below are a few comments from Dr. Mike Toews,\u00a0UGA Extension Specialist on Grain Storage<\/p>\n
For the first time in many years, we have several new products on the market as noted below.<\/p>\n
Products for Empty Bins<\/em><\/strong> Products for Application to Grain<\/em><\/strong> Diacon<\/strong> (labeled for corn and wheat). Diacon is an insect growth regulator that is effective for\u00a0killing nearly all immature grain moths and beetles, except weevils. The 4 oz per 1000 bu rate is\u00a0sufficient for tank mixing. See comments above for rates and activity.<\/p>\n Malathion<\/strong> (labeled for wheat and corn). Although widely used in the past, this product is no\u00a0longer recommended due to well documented resistance in many stored grain insect populations. Three-way tankmix<\/strong> (only tested on corn). UGA tests from 2014-2016 showed that a threeway\u00a0tank mix of Centynal (8.5 oz) plus Diacon IGR (4 oz) plus PBO-8 Synergist (13.5 oz) will\u00a0provide 6-9 months of protection from weevils. This is a moderately priced option for growers\u00a0in markets where other products are unavailable or cost is a limiting factor.<\/p>\n Regardless of the product used, be mindful that grain protectants are not a silver bullet. Shelled\u00a0corn should be dried to a maximum of 15% moisture content before dropping it in the bin.\u00a0Chemical applications should only be made to clean grain that will be stored for more than 3\u00a0months. Apply protectants at the bottom of the auger in a course spray to maximize coverage as\u00a0the kernels are moving up to the top of the bin. Long-term grain storage requires appropriate\u00a0moisture content, proper housekeeping, use of a spreader when filling bins, and managed\u00a0aeration.
\nCentynal EC.<\/strong> This is a good product for treating empty bins and elevator boots. Note that the\u00a0active ingredient in Centynal EC, Defense SC and Suspend SC are identical so these are not\u00a0good rotation partners.
\nDefense SC<\/strong> (labeled for empty bin use only). This is a good product for treating empty bins\u00a0and elevator boots, but is not labeled for application directly to grain. Note that the active\u00a0ingredient in Centynal EC, Defense SC and Suspend SC are identical so these are not good\u00a0rotation partners.
\nSuspend SC.<\/strong> This is a good product for treating empty bins and elevator boots. Note that the\u00a0active ingredient in Centynal EC, Defense SC and Suspend SC are identical so these are not\u00a0good rotation partners.
\nTempo SC<\/strong> (labeled for empty bin use only). Tempo is a good product for treating empty bins\u00a0and elevator boots, but is not labeled for application directly to grain.<\/p>\n
\nActellic 5E<\/strong> (labeled for corn only). This product has been the standard for many years, but it is\u00a0expensive. A full rate will provide protection from weevils for 9-12 months. Reducing the rate\u00a0will decrease the longevity of the protection. Our data suggest that Actellic is susceptible to heat\u00a0degradation in the drier when grain temperatures exceed 120 F.
\nCentynal EC<\/strong> (labeled for corn and wheat). Centynal EC is a new formulation that will
\nprovide 3 to 6 months of protection from weevils at the 0.5 ppm rate or 6 to 12 months of\u00a0protection at the 1.0 ppm rate. This material is heat stable in the drier (tested up to 150 F).<\/p>\n
\nDiacon IGR PLUS<\/strong> (labeled for corn and wheat). This product is a premix of Centynal EC and\u00a0Diacon.<\/p>\n
\nSensat<\/strong> (labeled for corn and wheat). This product is new to the market, but has been in our\u00a0evaluation program for several years. Test results show excellent weevil control for up to 12\u00a0months. No dryer stability data at this time.
\nStorcide II<\/strong> (labeled for wheat only). Storcide II is an industry standard for stored wheat, but is\u00a0not labeled for use on corn. Protection will degrade with heat and time.
\nSuspend SC<\/strong> (labeled for corn and wheat). This product is an older formulation that must be\u00a0completely suspended before measuring and requires frequent agitation. It provides 3 to 6\u00a0months of protection from weevils.<\/p>\n
\nAdditional information is available in the 2017 Georgia Pest Management Handbook or in a\u00a0recent Extension Publication<\/p>\n