New Oomycete-specific Fungicide from Syngenta

Micora™, a new fungicide from Syngenta, is now registered for use on greenhouse and outdoor ornamentals and vegetable transplants to be sold to retail consumers. Micora™ contains the active ingredient mandipropamid (a carboxylic acid amide), which is specific for the downy mildews and Phytophthora, and may be applied either as a foliar spray or a soil drench. Please read the label before using.

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Huanglongbing Confirmed in California

On Friday, March 30, the California Department of Food and Agriculture and the USDA announced that the citrus disease huanglongbing (HLB), also referred to as citrus greening, had been confirmed in a lemon/pummelo tree in a residential neighborhood in Los Angeles County.  An intensive survey of local citrus trees and psyllids is underway to determine the extent of the infestation.

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Rose Downy Mildew Is Active in Louisiana

Received a call from a local garden center last week regarding downy mildew on a shipment of roses from California that they had hoped to sell for Mother’s Day. Symptoms on the somewhat resistant cultivar Mr. Lincoln could easily be mistaken for a chemical burn.  Symptoms on the susceptible cultivar Purple Tiger included obvious lesions on the canes as well as the foliage.  Recommended controls measures are to isolate the highly susceptible cultivars from the rest, remove as much of the infected tissue as possible, and begin spraying on a regular basis with fungicides labeled for downy mildew control, such as Aliette, Stature, or a combination of copper and Mancozeb.

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Midas® Soil Fumigant Pulled from U.S. Market

On Tuesday, Arysta LifeScience Corporation announced that it was suspending sales of its soil fumigant Midas®  in the U.S. citing that the decision was based on an internal review of the economic viability of the product in the U.S. marketplace.  Midas® contains the active ingredient iodomethane (or methyl iodide), which is being used as a replacement for the fumigant, methyl bromide, in such crops as strawberries and tomatoes.

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Got Brown Patch?

I’m seeing a lot of large (brown) patch just waiting for the turf to green up a bit more and an extended period of wet weather to really get it going. Right now would be a good time to make an application of fungicide to slow it down. It’s on my list of things to do for the weekend!

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Home Garden Fungicide for Control of Rust on Mayhaw

Home orchard enthusiasts growing mayhaws now have a readily available fungicide they can use for control of rust caused by Gymnosporanium clavipes.  Mayhaw has been added to the new label for Spectracide Immunox Multi-purpose Fungicide containing the active ingredient myclobutanil. For control of rust, sprays should be applied beginning at the pink bud stage and reapplied every 7 to 10 days thereafter. However, no sprays should be applied within 14 days of harvest. Please consult the label for use rates and other pertinent information.

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Huanglongbing Found in Texas

The Texas Department of Agriculture and USDA APHIS announced this week that huanglongbing (citrus greening) has been confirmed in a citrus grove in Hidalgo County, Texas.  A portion of that county has been placed under an emergency quarantine order and a survey is currently being conducted to determine the extent of the disease in the area. Huanglongbing is one of the most destructive diseases of citrus and once a tree is infected, there is no cure.

For more information, please see the news release at:

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