Working on Nematode Resistant California Commercial Carrot

Nematode Resistant California Commercial Carrot On Its Way?

By Jessica Theisman, Associate Editor

Phil Simon is a carrot breeder and geneticist with the USDA Ag Research Service based at the University of Wisconsin. He produces the vast majority of carrots for the consumers throughout the nation. A big goal is to find a commercial carrot variety that is root-knot nematode resistant. Nematodes are a soil-borne, microscope, worm-like organism destroying production in some fields. Through lots of research, the carrot industry is getting closer to a resistant variety.

The first resistance gene was first discovered in 1992 in a Brazilian variety that may have some genetic resistance. The resistance was discovered by using derivatives from the Brazilian variety crossed with California-adapted carrots. This is all being done with, “the idea of moving that resistance gene into a carrot that’s suitable for California in terms of shape, size, flavor, and productivity,” Simon said.

The Brazilian variety is not suited to California because it is shorter and wider. It does not look like a California carrot, and it bolts very easy, which means it flowers and goes to seed. But with the Brazilian carrot having nematode resistance, it is also heat-tolerant, which is great news for us in California, especially with the rising temperatures.

It is said that California is getting closer and closer to getting its own commercial variety. “We’ve also found genes for resistance in other carrots from around the world, from Syria, China, Europe, and we intercrossed those also into California, so we’re putting a couple of genes in,” he said.

With all of these genes, this makes for an even stronger and durable resistance to nematodes.

Patrick Cavanaugh2021-05-12T11:05:16-07:00May 16th, 2017|

New Nematicide Available

New Velum One Nematicide Registered For Use in California

By Patrick Cavanaugh, Farm News Director

Horticulture crops in California and Arizona can now be protected by Velum One nematicide, a wide-spectrum nematicide that increases root health and suppresses key diseases.

“We’re excited to see Velum One go to work for growers in the key horticultural areas of California and Arizona,” Bayer Product Manager Joel Lipsitch said. “It’s another example of the innovation that our growers have come to expect from Bayer.”

Velum One suppresses nematodes below ground but also works by moving upward from the roots into the leaves of the plant to suppress key diseases and promote early season crop establishment. This activity has been shown to protect roots and establish the crop by limiting damage from a wide range of nematodes and key diseases, such as powdery mildew.

Trials have shown that Velum One aids in increasing yields as it protects plants from nematodes and disease.

“In tomatoes, for example, we’re seeing significant yield increases both from Velum One versus untreated and more importantly when Velum is added to grower-standard programs” Lipsitch said. “The combination of nematode and disease control really gives growers confidence that they are maximizing their yields and return on investment.”

Velum One is applied early in the growing season via drip chemigation. While it’s not meant to replace a fumigant, Velum One is most effective when used as part of a complete nematode management program.

Patrick Cavanaugh2021-05-12T11:01:59-07:00May 7th, 2017|

Lorsban Under Scrutiny

Chlorpyriphos (Lorsban) Must be Used More Carefully

By Patrick Cavanaugh, Deputy Editor

California Department of Pesticide Regulation (DPR) reports an important, broad-spectrum organophosphate insecticide known as Chlorpyriphos, or Lorsban, may be further restricted due to evidence of potential human health and environmental risks, presence (parts per billion) in some California waterways, and pressure from the EPA. Brian Leahy, director of the California Department of Pesticide Regulation, said, “Chlorpyriphos is an important tool and we know there are important times when you have to use it.”

Registered and widely used in agriculture across the nation for more than 40 years, DPR has made it a restricted-use material. Leahy said, “We are trying to work with the grower community to improve how they use it. We are also working with UC IPM to look at essential needs, but we know that as we look at Chlorpyriphos, we are going to have to put additional restrictions on it.”

“We simply need for it to stay on target, and not be getting into the human body. We are seeing that it is, and we are going to continue to make sure that people use it thoughtfully and wisely,” he said.

And Leahy is very confident that growers can use this material and keep it on target, “I have seen farms that use it only when they really need it, and that is what we want. We can’t lose this tool and we are going to keep it only by showing we can greatly reduce off-site movement to the human body and watersheds,” he noted.

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Resources:

According to the University of California Agriculture and Natural Resources 2014 Chlorpyrifos Report entitled, “Identifying and Managing Critical Uses of Chlorpyrifos Against Key Pests of Alfalfa, Almonds, Citrus and Cotton“:

Chlorpyrifos plays a critical role in many IPM programs for controlling pests that threaten the productivity and economic well-being of California producers and in maintaining the high quality standards required by consumers and international export markets. This active ingredient also allows production of animal feed to support the important dairy industry in California. For some pests, chlorpyrifos is one of the last effective organophosphate insecticides available and may provide an important alternative mode of action for insecticide rotations to prevent the development of resistance to newer insecticide products. For others, this product is one of very few products with international registrations with established maximum residue limits (MRLs) that allow unhampered trade. Chlorpyrifos may also be a key tool for controlling invasive pests as well as endemic pests occasionally found in extremely high population densities.

The California Department of Pesticide Regulation reports that the combined use of chlorpyrifos in alfalfa, almonds, citrus, and cotton has decreased since 2006.

Although newer insecticides are also available to manage some pests in these four crops, there is a continued need to preserve the availability of chlorpyrifos for specific situations.

“Assessing the Health Risk of Pesticides,” California Department of Pesticide Regulation

California Ag Today2021-05-12T11:03:04-07:00February 16th, 2016|

Winegrape Rootstock Trials

Winegrape Rootstock Trials for Pest Resistance and Vine Productivity

By Patrick Cavanaugh, Deputy Editor

Larry Bettiga, a viticulture farm advisor with UC Cooperative Extension, Monterey County, is working with county growers on winegrape rootstock trials to increase vine productivity.

“Several things have happened,” noted Bettiga,“we are replanting vineyards on former vineyard lands, where a build-up of soil pests already exists. Farmers used to grow a lot of beans and tomatoes in the Valley, so we’ve had a lot of root-knot nematode populations from past cropping patterns.”

“We’ve recently seen ring nematode populations developing at multiple vineyard sites,” Bettiga continued. “With the loss of more effective fumigants, and then the loss of post-plant-type nematicides, the use of nematode-resistant roots is becoming more critical to the success of replanting these vineyards. We have hopes that Andy Walker, a UC Davis viticulture professor and grape breeder, is going to supply us with some better options than we currently have.”

“We have a site where we are comparing five new rootstocks that were released from UC Davis with a number of our standard rootstocks. We are just starting that work, so obviously we have to look at them for several years to get a good feel for how those stalks will fit in comparison to what we are now using,” he noted.

California Ag Today2016-05-31T19:27:05-07:00October 30th, 2015|