Magister Miticide/Fungicide Labeled

David Owens, Extension Entomologist;

The miticide/fungicide Magister (Fenazaquin) has been labeled by Gowan on melons, fruiting vegetables, hops, legumes, and fruit trees. Only one application can be made per year, and applications should be made in at least 50 gallons per acre. It is a group 21A miticide, same mode of action group as the miticide Portal (Fenpyroximate) and the insecticide Torac (Tolfenpyrad). For resistance management, do not apply either product before or after applying Magister. It also has pollinator protection language on its label. Be sure to consult the label and the special pollinator language before making applications.

Vydate Registration Review; EPA Accepting Comments

David Owens, Extension Entomologist,

EPA is accepting comments to oxamyl (Vydate) registration review, docket number EPA-HQ-OPP-2010-0028. You can find it by following this link: or by searching with the docket number above. In short, they are proposing reducing applications to 4 per season, removing aerial and airblast applications, and lengthening REIs to 3 days for all cucurbits, 4 days for potato, and 5 days for onion. Maximum application rates would be 1 lb a.i./acre. Application equipment cannot be greater than 2 feet above canopy. EPA is proposing to remove vydate from celery, eggplant, peanut, tobacco, tomato, and orchard uses. If these proposed changes impact your farming operation, please let me know and use the link to comment and provide EPA feedback. The comment period closes October 9.

Chlorpyrifos Ordered Removed from Sale

On August 9, 2018, in a split decision, a federal appeals court ruled Thursday reversed an Environmental Protection Agency (EPA) decision to keep the insecticide chlorpyrifos on the market. In October 2015, the Obama administration proposed banning the pesticide’s use on food. The EPA reversed that effort in March 2017, adopting Dow’s position that the science showing chlorpyrifos is harmful was inconclusive and flawed.

Chlorpyrifos was created by Dow Chemical Co. in the 1960s. It remains among the most widely used agricultural pesticides in the United States, with about 5 million pounds domestically each year through its subsidiary Dow AgroSciences. Dow voluntarily withdrew chlorpyrifos for use as a home insecticide in 2000. EPA also placed “no-spray” buffer zones around sensitive sites, such as schools, in 2012.

Appeals Court Judge Jed S. Rakoff wrote in August 9, 2018 majority’s opinion, “The panel held that there was no justification for the EPA’s decision in its 2017 order to maintain a tolerance for chlorpyrifos in the face of scientific evidence that its residue on food causes neurodevelopmental damage to children,”

The 9th U.S. Circuit Court of Appeals in San Francisco ordered the Environmental Protection Agency to remove chlorpyrifos from sale in the United States within 60 days. EPA spokesman Michael Abboud said the agency was reviewing the decision. It could appeal the ruling to the Supreme Court.

A PDF of the decision is here:

Additional Labeled Uses for Torac in Vegetables

David Owens, Extension Entomologist,

Several uses have recently been added for Tolfenpyrad, the active ingredient in Torac, a group 21A insecticide/group 39 fungicide. It has efficacy on thrips, aphids, several leps, and Colorado potato beetle. It is also labeled for powdery mildew. Torac is contact only. Crop sites and a few of the interesting pests that have been added are potatoes (potato beetle, leafhopper, aphids, thrips, psyllids), brassica leafy greens (aphids, flea beetles, thrips, maggots, diamond back moth), fruiting vegetables (aphids, thrips), and cucurbits (aphids, thrips, powdery mildew). The label also lists cucumber beetle as suppressive only. Supplemental labels can be found for the following

Aerial potato and potato:,

Fruiting vegetables:


Brassicas and brassica greens:,

Please be aware that this product is toxic to bees, do not apply when bees are actively foraging. Please also refer to the specimen label for additional guidance:

Venom Approved for BMSB in Some Fruit

David Owens, Extension Entomologist, and Bill Cissel, Extension Agent – Integrated Pest Management;

A Section 18 label for Venom (dinotefuran) has been approved for use on Delaware stone and pome fruits for brown marmorated stink bug management. This chemical has lower risk to beneficial insects. Maximum size of fruit orchard treated with Venom is 415 acres. There is a 12 hour REI, 3 day PHI.

Blueberry Insecticide Update

David Owens, Extension Entomologist,

Gowan’s Malathion 24c label for Spotted Wing Drosophila control in blueberries has been renewed. The 24c label supports higher rates for improved performance. Be sure to check the label for other application directions, timing, allowed applications, and other restrictions. You must also have a copy of the 24c label when using this product. You can find the label here:

Lima Bean Nematicide/Insecticide Update

David Owens, Extension Entomologist,

Amvac’s Mocap EC nematicide/insecticide has been approved for use on lima beans in Delaware for nematode control as a 24c special local needs label. Previously, the granule formulation was available. The EC formulation allows for additional flexibility regarding application equipment. Be sure to check the label for application restrictions and guidance on application. Please note that the product must be soil incorporated – it does have phytotoxicity concerns if in direct contact with the seed. Also, watch out for rotational restrictions, especially if small grains are in your farming operation. Consult both the specimen label and the 24c label for guidance. If using the product, you must have a copy of the 24c label in your possession. You can find the 24c label here: and the specimen label here:

Section 18 for Brigade and Bifenture on Tree Fruit for BMSB

Bill Cissel, Extension Agent – Integrated Pest Management;

Our Section 18 renewal request for Brigade WSP manufactured by FMC Corporation and Bifenture EC and Bifenture 10DF, both manufactured by United Phosphorus, Inc. has been approved by the EPA for use on apple, peach, and nectarine to manage Brown Marmorated Stink Bugs. This use expires on October 15, 2017. You must have a copy of the label in your possession before making an application. Please contact Chris Wade at the Delaware Department of Agriculture ( or Bill Cissel ( for more information.

Chlorpyrifos Registration Update

Bill Cissel, Extension Agent – Integrated Pest Management;

The EPA has denied a petition from the Pesticide Action Network of North America and Natural Resources Defense Council to revoke all pesticide tolerances and cancel all chlorpyrifos registrations. The EPA “will continue to review the science addressing neurodevelopmental effects of chlorpyrifos”. Chlorpyrifos remains registered as it undergoes registration review and the EPA intends to complete the assessment by October 1, 2022. Here are a couple links for more information about EPA’s order to deny the petition to revoke all tolerances for chlorpyrifos:

Belay Label Change

Bill Cissel, Extension Agent – Integrated Pest Management;

Valent is voluntarily removing or limiting certain crop uses of Belay® insecticide. All Fruiting Vegetable and Cranberry uses have been removed. Uses for Cucurbits, Grape, and Potato have been modified. These changes have been made to both State and Federal labels. If you have inventory with the old Belay label, it can be used since an expiration period has not been imposed. Belay produced after April 1, 2017 will have the new label and can be distinguished by its new color scheme.