Raspberry & Blackberry Pest and Disease Alerts

Our friends at Cornell Cooperative Extension share these tips for managing pests and diseases in raspberry and blackberry during this unusually wet summer.

Tarnished plant (lygus) bug levels are high in caneberries. We’re also seeing some damage to cut flowers following feeding on buds.  Insect feeding through buds, in open blooms, or on developing fruits stunts berries. Cornell Guidelines suggest a threshold of 10-20% infested canes. In caneberries Assail, Befenture 10DF, carbaryl/Sevin, Danitol, are labeled; Brigade DF can be used in caneberries but isn’t labeled for TPB but will provide incidental control used for other labeled pests (Brigade also has a supplemental label in NY for spotted-wing drosophila). In organic production Mycotrol, Grandevo, PFR-97 and PyGanic are labeled, but emphasize good weed management. (This information is from Dan Gilrein, CCE Suffolk.)

Spur blight (Didymella applanata) has unsurprisingly reappeared in many cane berry plantings. This fungal disease loves the wet humid weather we are having. Dense plantings usually have problems even in dry years, but this year even well-pruned plantings may see this disease. Chocolate brown to purple blotches appear at the buds of canes. This results in weak or no growth from those buds and an overall lack of vigor. 

Prune and destroy diseased canes before next spring. There are plenty of fungicides labeled for this disease but take care when applying at this time of year, especially in hot weather. You can get foliar burn from some of the pesticides. The best time for control is delayed dormant in the spring. 

Cane blight (Leptosphaeria coniothyrium) are similar in appearance to spur blight, but the lesions can be found all along the cane. Often the two diseases appear together. Cane blight is more common in black and purple raspberries, but can also infect red raspberries. Prune and destroy infected canes asap. Best control comes from delayed dormant sprays of lime sulfur. 

New study looks at the susceptibility of fruit fungal communities to SWD

Naturally occurring yeast on fruit is the subject of a new study on how SWD are attracted to berries. (Photo by Robert Bogdan for Pexels.)

A new study out of Europe examines which types of naturally occurring yeasts attract SWD. The authors of the report conclude that the fungi, specifically Saccharomycetales yeast communities, are more abundant on raspberry. The authors believe awareness of this fact might lead them to better understand what drives SWD susceptibility of different fruit crops at different sites. They suggest that it may also inform the “seeding” of fruit with engineered fungal/yeast communities, in order to reduce their vulnerability to the pest.

The abstract states:

“Fungal metabolic volatiles attract Drosophila suzukii which oviposits in ripening fruits, but there are few data describing the fungal microbiomes of commercial fruits susceptible to this insect pest. We tested the hypothesis that fruit type and ripening stage have a significant effect on fruit surface fungal communities using DNA metabarcoding approaches and found strong support for differences in all three fungal community biodiversity metrics analysed (numbers, types, and abundances of taxa). There was an average fivefold greater difference in fungal communities between sites with different fruit types (strawberry, cherry, raspberry, and blueberry) than across fruit developmental stages, demonstrating site and/or fruit type is the greater factor defining fungal community assemblage. The addition of a fungal internal standard (Plectosphaerella cucumerina) showed cherry had relatively static fungal populations across ripening. Raspberry had a greater prevalence of Saccharomycetales yeasts attractive to D. suzukii, including Hanseniaspora uvarum, which aligns with reports that raspberry is among the fruits with greatest susceptibility and attraction to D. suzukii. Greater knowledge of how yeast communities change during fruit maturation and between species or sites may be valuable for developing methods to manipulate fruit microbiomes for use in integrated pest management strategies to control D. suzukii.”

Read the full paper here.

https://rdcu.be/cR4WP

Member Spotlight: Tomion's Farm

Member Spotlight:

Tomion's Farm market

Farming has been part of the Tomion’s Farm family for so long that co-owner Alan Tomion is stumped when asked when they first established the business. He laughs and explains, “My great-grandfather started growing strawberries, and my father added vegetables. Then I expanded it with raspberries, hay, rhubarb. So it’s definitely been over 50 years. The farm has always been in our family.”

Located in the Finger Lakes in Penn Yan, the 160-acre Tomion’s Farm and store is open year-round, and sells strawberries, red raspberries, and blackberries, as well as a variety of fruits, vegetables, and live plants. The operation is primarily retail, with wholesale strawberry sales in the summer. The store also offers fresh baked goods and a selection of gifts.

Alan’s wife and co-owner, Crystal Tomion, runs the farm market, and oversees a handful of year-round part-time employees. Two of the couple’s sons have also joined the business.

While SWD was an issue for the Tomions’ fall raspberries a few years ago, the farm’s proximity to the Geneva Experiment Station has allowed them to benefit from the expertise of Professor Greg Loeb, who has conducted research on the farm, and their strawberry crops have been unaffected. Instead, the biggest challenge has been finding summer laborers. Alan says, “There needs to be some kind of program for workers who aren’t citizens to be able to make a living and not be hassled,” and notes that tightening restrictions against noncitizen workers have reduced their seasonal prospects from 100 to about a dozen.

Another challenge originates closer to home. The local Mennonite community, with their larger families and tradition of training their children as the next generation of laborers, are able to sell produce at a much lower price than farms with higher labor costs. “They’re stiff competition,” Alan admits.

Also stiff competition: grocery stores that sell peeled and washed produce and prepackaged dinners, and that target their marketing toward busy families and career people. “Older customers know that local berries have a lot more taste and nutrition,” Alan says. “But we’re slowly losing our older customers. Eating habits among younger people have changed quite a bit. They go out to eat more and buy more premade meals. And they don’t buy extra to freeze, like our older customers do.”

Still, Tomion’s Farm, which benefits from its high-visibility location on the busiest highway in the county, has succeeded for more than half a century by sticking to its mission of providing high-quality local foods. Alan and Crystal used to do more marketing and advertising, but ultimately decided that the cost outweighed the extra revenue that was needed to cover it. They now rely on their website and Facebook page, a few ads in local newspapers and magazines, and the word of mouth of customers, to spread the berry gospel.

Although Alan loves seeing first-time customers turn into repeat customers, for him, it all comes back to getting hands-on in the earth. “Farming is in my blood,” he says. “I just enjoy watching my crops grow.”