Posts Tagged: nematode
Dry beans are an important rotational crop in the Southern San Joaquin Valley. They are not a high value crop, so effective growing and marketing practices are a priority. The dry bean meeting held at Kearney on August 27, 2013 attracted about 30 attendees. It focused on many aspects of new crop management and marketing strategies to improve the return per acre of dry beans.
There were four field presentations. Larry Schwankl, UC Cooperative Extension irrigation specialist at Kearney Agricultural Research and Extension Center, and Carol Frate, UC Cooperative Extension advisor in Tulare County, alfalfa, dry beans, corn and plant pathology, discussed a subsurface drip irrigation trial for blackeye production. Carol Frate discussed the evaluation of insecticides for lygus bug management. Phil Roberts, chair and professor in the Department of Nematology at UC Riverside, nematode host-parasite relations, genetics and pest management in field and vegetable crops, discussed screening bean varieties and breeding lines for root knot nematode resistance. Phil Roberts and Bao Lam Huynh discussed developing new varieties of beans for insect and disease resistance.
Indoor sessions included PowerPoint presentations and related discussions. Gary Luckett, manager of the Cal-Bean & Grain Warehouse, provided an update on the blackeye market. Bao Lam Huynh discussed using marker-based techniques for developing new blackeye varieties. Kurt Hembree, UC Cooperative Extension advisor in Fresno County, weed management strategies in crop and non-crop settings, discussed past, present and future methods of weed control in dry beans.
The meeting provided:
- PCA hours: 1.5 hours of “other”
- CCA hours: 1.5 hours of IPM; 0.5 hours of crop management
Dry bean meeting attendees learning about the impact of subsurface drip irrigation on crop health and yield.
In recent weeks, veterinarians at the UC Davis William R. Pritchard Veterinary Medical Teaching Hospital have seen a spike in accidental rodenticide poisonings. In the last two weeks of August alone, they diagnosed and treated six canine cases.
If not treated, a dog can die within a week of ingesting rodenticides.
"This is an all-too-common occurrence," said Karl Jandrey, assistant professor of clinical small animal emergency and intensive care at UC Davis. "People are trying to get rid of unwanted rodents, but are not realizing what these toxins do to the other animals who share that environment."
Keeping pets safe
Using proper pest control techniques can help keep family pets safe, said Roger Baldwin, UC Cooperative Extension advisor with the UC Integrated Pest Management Program. Baldwin, a wildlife pest management expert, is based at the UC Kearney Agricultural Research and Extension Center in Parlier.
Dogs can be affected by rodenticides two ways: by eating the poisoned bait or by eating an animal that was poisoned. Both can have serious consequences.
Home improvement stores like Lowes and Home Depot, and even grocery stores, carry a variety of products that may be used to control unwanted rats, mice, pocket gophers and ground squirrels. If the unwanted animals are inside the house, Baldwin recommends using traps rather than poison.
"If a poisoned animal dies behind a wall, you can't get it out and you have to live with the smell for weeks or months," Baldwin said.
Also, before baiting outdoor pests, Baldwin suggests making sure they are not also going inside buildings. If they are, find all potential access points and close them up.
If resorting to poison baits, buy a new product at the store and carefully read the label to understand when, where and how it can be used. Because of rapidly changing restrictions in recent years, old products in your garage or shed could be outdated.
Pocket gopher bait must be placed in the gopher's underground burrow. Even there, Baldwin said, certain dogs will dig up dead pocket gophers if they are close enough to the surface. Families with digging dogs will likely want to choose gopher traps. For ground squirrels, baits can be placed in bait stations or scattered very thinly on the ground through broadcast or spot treatments.
"When you use broadcast or spot treatments, there is relatively little danger to dogs or cats," Baldwin said. "But I would opt to use bait stations in my yard if I had pets running around, just to be on the safe side."
Some rodenticides contain ingredients that are anticoagulants, which slow the clotting of the blood. When dogs ingest these poisons, the active ingredients concentrate in the liver where they interfere with vitamin K storage and the production of blood clotting factors.
At UC Davis' veterinary teaching hospital, dealing with accidental poisoning by an anticoagulant rodenticide can require around-the-clock care with treatments in the intensive care unit to replenish blood clotting factors with fresh frozen plasma and replace vitamin K. If administered early enough, this treatment usually leads to a full recovery. Other rodenticides (e.g., bromethalin, cholecalciferol, strychnine and zinc phosphide) do not have antidotes, so treatment is more difficult.
One patient recently treated at UC Davis was Mocha, a one-year-old Belgian Malinois from Winters, Calif. Mocha had gotten into d-CON, a common rodenticide available at hardware stores.
Luckily, Mocha was brought to the veterinary teaching hospital in time. She responded well to treatment and was able to go home in two days.
"We are grateful for the care Mocha received at UC Davis," said Ken Shaw, Mocha's owner. "Like most dogs, Mocha is adventurous and likes to get into things she shouldn't. But after the treatment at UC Davis, she was home within a few days, happy and playful once again."
When award-winning photographer Teresa Willis of Vacaville encountered a red caterpillar on a dirt road at about 6000 feet in a canyon north of Paradise Valley, Nev., she did what photographers do--she captured an image of it.
And posted it on her Facebook page where some of her friends likened it to the Oscar Mayer weiner.
The caterpillar is indeed red. Bright red. Well, what is it?
Renowned butterfly expert Art Shapiro of UC Davis, who knows about such things, says it is the larvae of an owlet moth (family Noctuidae) "and the species is probably Noctuid."
"It's infested with the parasitic nematode Heterorhabditis bacteriophora, a generalist parasite of insect larvae, which it turns bright red," Shapiro says. "Experiments have shown that this acts as a warning color, deterring visual predators (such as birds) from eating them (and the nematodes in the process)."
Hardly any Lepitoptera escapes identification from Art Shapiro, who maintains the popular website, Art's Butterfly World at http://butterfly.ucdavis.edu/ and is a UC Davis professor of evolution and ecology.
As for Teresa Willis (see more of her work at http://www.redbubble.com/people/teresalynwillis), you can say she got the red out.
With the help of a parasitic nematode, Heterorhabditis bacteriophora.
Larvae of an owlet moth turned bright red by the parasitic nematode Heterorhabditis bacteriophora. (Photo by Teresa Willis)
Red caterpillar on the move--but it probably won't be eaten by birds. (Photo by Teresa Willis)