Virginia AG Pest Advisory
| Jul-02-2009 Peanut (Insect) From Ames Herbert |
Peanut insect pest update, potato leafhoppers on the move It is worth noting that potato leafhoppers are active in some peanut fields. In some of our plots, especially those that were not treated with in-furrow insecticides for thrips, we are approaching threshold levels of damage. Our recommendation is to treat fields if 20-25% of leaves show typical hopper burn leaf damage symptoms (the yellow V-shaped pattern on the leaflet tips) and hoppers are still present in the field. It is important to determine if leafhoppers are still present because we have found that they typically migrate into and back out of peanut fields throughout the season, and may not actually be present even when leaf damage symptoms are obvious. Mid July is a fairly common time to begin seeing thresholds, if they are going to occur. We recommend checking fields just prior to making other sprays (example, leafspot) so insecticides can be tank mixed if a threshold for leafhoppers is detected. Several pyrethroid insecticides are listed for potato leafhopper control. Also, Lorsban 15G will provide some control, if applied for soil insect control. |
| Jul-02-2009 Cotton (Insect) From Ames Herbert |
Cotton insect pest update All is still pretty quiet in terms of cotton insects. Although plant bugs are out there, we know of only one field that was treated. Square retention is good in all the fields we have checked and similar reports are coming in from local crop scouts. Although you can find spider mites in most fields, none are even close to threshold. Aphids are also present, but in very low numbers. Rain (or lack thereof) may be the bigger issue in many areas. Cotton will be blooming soon, and we will begin to shift to sampling developing bolls for stink bug damage. More on that next week. |
| Jul-02-2009 General Comments (Insect) From Ames Herbert |
Our corn earworm pyrethroid susceptibility monitoring program indicates a possible problem in the making As you may recall, each year we assess the susceptibility of corn earworm to pyrethroids using the standard AVT (adult vial test) process. This involves collecting live moths using pheromone baited traps from multiple locations across the area. Moths are individually placed into vials pre-treated with cypermethrin (the standard used across the southeastern states) and assessed for mortality after 24 hours. If moths survive this 24 hour exposure, they are considered to be resistant. The percentage of those that survive provides some indication of what growers might expect to see when they apply pyrethroids to crops (soybean, cotton, peanuts). Although not a perfect system for determining actual resistance levels in the population, this procedure does provide valuable insight. For example, last year we had unusually large numbers of survivors. Whereas in previous years we had seen 5 to 10% survivors, in 2008, survivorship in late June exceeded 20%, and then increased to over 40% by August. Over the course of the summer, we received several calls about spray failures: cases where application of normal rates of commonly used pyrethroids did not provide adequate levels of corn earworm control. So, what is the situation this year? Things do not look good. We started the season in early June with less than 10% survivors (see the attached line graphs, 2008 on the left side, 2009 on the right side) but are now at over 30% survivorship, even higher than at this time last year. Granted these data are based on a very small subsample of moths (744 moths to date), but all indications are that we may be in for some problems. Of course things could change as we progress through the season. We will continue to provide updates. [More] |
| Jul-02-2009 General Comments (Insect) From Sean Malone |
Corn earworm moth black light trap captures for the week ending July 2, 2009 Corn earworm moth captures ranged from <1 to 5 moths per night. Please see the attached table for more information. [More] |
| Jul-02-2009 Turf and Ornamentals (Insect) From Sean Malone |
Virginia Issues Fire Ant Quarantine in 11 Localities The following advisory is being sent on behalf of Dr. Pete Schultz, Entomologist and Director of the Virginia Tech Hampton Roads Agricultural Research and Extension Center. Virginia Department of Agriculture and Consumer Services has issued a temporary state quarantine for 11 localities in southeastern Virginia. Details as to the locations and regulated articles are available at their website (copy and paste address into your browser): http://www.vdacs.virginia.gov/news/releases-b/062409fireants.shtml |
| Jul-01-2009 Fruits and Vegetables (General) (Disease) From Steven Rideout |
Super Tin Now Labeled for use on Virginia Potatoes Super Tin (Either the 4L or 80WP formulation) is now registered for use on potatoes in Virginia. Super Tin is labeled for use on both early and late blight. |
| Jun-26-2009 Fruits and Vegetables (General) (Disease) From Steven Rideout |
New 2ee label for Previcur Flex/Admire Pro Tank Mix at Transplanting Please see Bayer's new 2ee label for a Previcur Flex/Admire Pro Tank Mix at Transplanting for several vegetable crops. [More] |
| Jun-26-2009 Fruits and Vegetables (General) (Disease) From Steven Rideout |
Revus now labeled for potato ad tomato in Virginia Due to the recent outbreak of late blight and a shortage of Revus Top, Syngenta has been approved for the attached supplemental label for Revus on potatoes and tomatoes for late blight. [More] |
| Jun-26-2009 Fruits and Vegetables (General) (Disease) From Steven Rideout |
Cucurbit Downy Mildew Update Cucurbit downy mildew continues to be discovered in new locations in the SE part of the state. This week we found the disease on cucumbers near Petersburg, VA and also in southern Northampton County on the Eastern Shore. Please continue to monitor cucurbi fields for this disease. Grower particularly those in the SE part of the state are urged to include Ranman, Presidio or Previcur Flex in their spray programs. |
| Jun-26-2009 Fruits and Vegetables (General) (Disease) From Steven Rideout |
Virginia Potato Disease Advisory for June 24 Please see attached Potato Disease Advisory [More] |