While the recent rains and warmer temperatures are a welcome sight as people long to put winter behind them for another year, the same environmental conditions can jump-start overwintering diseases. To nip these diseases in the bud, it’s important for almond growers to walk their fields, look for disease systems and apply fungicidal sprays to prevent those diseases before they can become an issue.
Brown Rot Blossom Blight
Brown rot blossom blight (Monilinia laxa) was a challenge this past year, which means there’s a likelihood that it has overwintered in twig cankers and any remaining flower parts that may have been infected. Spore pads will appear in late winter with infection occurring in spring when spores transfer by air or rain.
Preventative sprays at pink bud and full bloom are the best option to stop the disease before it takes hold. ELEVATE® Fungicide is a locally systemic fungicide featuring fenhexamid (FRAC group 17), an active against Monilinia. It is rainfast shortly after application and tank-mixable with different broad-spectrum fungicides, and it has no known cross-resistance.
Higher density plantings in almond orchards can prevent orchard floors from drying out during the day, resulting in perfect conditions for diseases like Almond scab (Cladosporium carpophilum) to proliferate. Growers should walk their orchards with their pest control adviser (PCA) to look for signs the disease is present such as sporulating twig lesions. Beginning treatment as early as possible by applying fungicide sprays will help keep Almond scab in check before it can cause defoliation and weaken almond trees, which could impact yield later in the season.
Two great disease-fighting tools growers have available to help are SYLLIT® Fungicide and PH-D® Fungicide.
SYLLIT Fungicide is a tank-mixable product that protects emerging buds from infection. It is rainfast after two hours and offers protection on wet foliage, and its efficacy is not affected by temperature. It also helps control Alternaria, Anthracnose, Brown rot and Shothole.
PH-D Fungicide is a broad-spectrum control ideal for treating diseases like Scab, Shothole, Rust and Alternaria. It serves as a good rotational tool and tank-mix partner due to its unique mode of action. It works by preventing fungal cell wall construction via chitin inhibition by enzyme interference, making it a good choice to use in a rotational management program when multiple applications are needed.
Anthracnose is one of the key diseases that impacts almond orchards in early spring. Blossom blight is one symptom of the disease along with fruit infections that often have spur and limb dieback. To prevent long-lasting damage from the disease, the first fungicides should be applied at pink bud and be repeated every 10 to 14 days as rain continues. Solid options include SYLLIT and PH-D, which also help combat other key almond diseases.
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DIMILIN is a restricted-use pesticide. Always read and follow label directions. ELEVATE, PH-D and SYLLIT are registered trademarks of an Arysta LifeScience Group Company. Arysta LifeScience and the Arysta LifeScience logo are registered trademarks of Arysta LifeScience Corporation. ©2018 Arysta LifeScience Group Company. SPC-1817.