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Updated: April 18, 2022
Plectosporium Blight in Some Pumpkin Fields this Year - 2021
I am seeing some plectosporium blight in a few pumpkin fields this year, not as bad as last year but still there. This disease will probably increase if we continue having frequent rains in some locations.
Updated: April 18, 2022
‘Bruising’ on Strawberry Foliage
Over the last few weeks I have been sent pictures of and have seen dark spots on the foliage of strawberry plants (figs. 1 and 2).
Updated: April 18, 2022
Allium Leaf Miner Active Now
f you are growing fall leeks or garlic or other Allium species you need to, for the next month or so (September-first freeze) watch for the tell-tale marks left by Allium leaf miner.
Updated: April 18, 2022
Edema Problem in Greenhouse Tomatoes
An odd problem was seen in tomato plants being grown for harvest in a greenhouse that showed blister- or callus-like growths usually along veins that first appeared on the underside of older leaves (fig. 1). Leaves also showed unusual curling and other odd distortions on the top side of the leaf (fig. 2).
Updated: April 18, 2022
Check for Allium Leaf Miner in Onions and Leeks Over the Next Few Weeks
If you grow leeks or onions or other Allium species, now and for the next few weeks is the time to watch for the tell-tale marks left by Allium leaf miner. Allium leaf miner Phytomyza gymnostoma tell-tale marks consist of several small round white dots (made by the female’s ovipositor) in a row that appear on the middle towards the end of leaf blades (fig. 1) of their preferred hosts of leeks, onions, garlic and other Allium species.
Updated: November 5, 2021
Basil Downy Mildew Cultivar Study
Summary: This study examined five cultivars (Passion, Obsession, Devotion, Thunderstruck and Prospera) of basil that are reported to have resistance to basil downy mildew with a susceptible cultivar (Aroma). A field trial was planted in July and harvested throughout the summer and fall. Four of the five cultivars (Passion, Obsession, Devotion and Thunderstruck) became infected with downy mildew at the same time as did the susceptible cultivar (Aroma). In this study only Prospera did not develop downy mildew symptoms. The infected cultivars had significantly reduced marketable yields at first and then no marketable yields 4 weeks after infection. Prospera continued to have good marketable yields throughout the entire study period.
Updated: September 17, 2021
Big-Eyed Bug: A MVP of Generalist Natural Enemies
Big-eyed bugs are predatory “true bugs” in the genus Geocoris. They are members of the family Lygaeidae (seed bugs), but belong to a subfamily containing only predaceous insects. As the name implies, they have characteristic, large prominent eyes relative to their body size. Many different Geocoris species are found throughout the world but there are roughly 25 recognized species in the US. Though big-eyed bugs are prominent in several cropping systems within the US, their importance expands well beyond US borders as they are among the most abundant species of generalist predators occurring naturally worldwide.
Updated: September 17, 2021
Unusual Foliar Blight Found in Southern Maryland Organic Tomatoes
A very unusual and seldom seen tomato foliar blight was found by an intrepid county educator in Southern Maryland last week.
Updated: September 16, 2021
Grasshoppers in High Populations
This season keeps with the weird and unusual with reports of grasshoppers causing damage in many different vegetables.
Updated: September 16, 2021
Corky Root Disease in Tomatoes
Corky root is caused by the fungus Pyrenochaeta lycopersici. Tomato plants affected with corky root may appear stunted and generally lack vigor.
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