What’s the Difference Between Metolachlor Formulations?
I have been asked by a few people about the differences in metolachlor (the active ingredient in Dual) products. The “old” Dual in the early 1990s was two isomers of metolachlor, R and S isomers. The...
View ArticleCorn Herbicides and Soil Insecticide Interactions
Over the past few years, a few fields have been treated with an organo-phosphate insecticide and then with an ALS-inhibiting herbicide and significant injury has occurred. A number of corn herbicides...
View ArticleNo-Till Soybean Burndown Considerations
Due to the weather, a number of no-till soybean fields have not received a burndown treatment yet. As a result, many are asking about options for control. First a number of considerations: 2,4-D ester:...
View ArticleHerbicide Classification Chart Available
Working with the Delaware Soybean Board and the United Soybean Board, a herbicide classification chart is available at:http://extension.udel.edu/ag/weed-science/weed-management-guides/ This chart...
View ArticleFree, Updated Agronomic Crops Weed Control Guides
Available from the UD-REC website are weed management guides for assistance in weed control in corn, soybeans, or forages. http://extension.udel.edu/ag/weed-science/weed-management-guides/ There is a...
View ArticleControlling Emerged Palmer Amaranth in No-Till Burndown
I have observed a lot of emerged Palmer amaranth seedlings. Early planted corn should be scouted at 4 weeks after planting to determine if a POST herbicide application is needed. A lot of no-till...
View ArticleTankmixing Reflex (fomesafen) with Glyphosate
There have been many situations where both fomesafen (active ingredient in Reflex) and glyphosate will complement each other for weed control. Syngenta has a premix of fomesafen plus glyphosate called...
View ArticleNot All “Buggy-Whipping” in Corn is Due to Herbicides
Buggy-whipping in corn is a common sight early in the growing season and later under certain environmental conditions. The cause of buggy whipping is the abnormal formation of waxy leaf layers causing...
View ArticleThoughts on Postemergence Herbicide Applications
The early-planted corn fields should have been sprayed postemergence for later emerging weeds. In later planted fields, morningglories can be a challenge. Glyphosate is quite effective on small...
View ArticleWeekly Crop Update: Soybean, Winter Wheat, & Barley
Postemergence Management of Glyphosate-Resistant Horseweed in Soybeans Palmer Amaranth Control in Soybeans Harvest Aids for Small Grain Postemergence Management of Glyphosate-Resistant Horseweed in...
View ArticleWeed Control Options for Double Cropped Soybeans
With small grain harvest underway, there are some questions about preplant weed control with double cropped soybeans. This has always been a challenging situation, and with the presence of...
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Weekly Crop Update: Remove Weeds Before Seeds Mature
This week in U Del Weekly Crop Update: Remove Weeds Before the Seeds Mature Livid Amaranth Remove Weeds Before the Seeds Mature Many weeds have started to flower in the past week or two. Weeds,...
View ArticleLate-Season Palmer Amaranth Management: Focus on Stopping Seed Production
A number of calls have come in about options to control large Palmer in full-season soybeans. The beans are 30 to 36 inches tall and the Palmer amaranth plants are poking through the canopy. In most...
View ArticleFall Control of Perennial Weeds
Fall is the best time to treat most perennial weeds because it is the time that plants are best able to move the herbicide to the roots where it will do the most good. When considering fall weed...
View ArticleConsiderations for Small Grain Weed Control
For no-till fields, a non-selective herbicide needs to be used prior to planting. If grasses or perennial weeds are present, glyphosate is a better choice than paraquat. Fields worked with a vertical...
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