Virginia AG Pest Advisory
| Sep-02-2010 General Comments (Insect) From Sean Malone |
Corn earworm moth pyrethroid resistance monitoring update For the last week of August 2010, about 35% of corn earworm moths survived 24 hours of exposure to 5 micrograms of cypermethrin (a pyrethroid) in our vial tests. Moths were collected from pheromone traps in Suffolk, VA. We have evaluated 2,598 vials so far this season. Please see the attached line graph to see results for the entire season. [More] |
| Sep-02-2010 Soybean (Disease) From Ames Herbert |
Soybean Rust Update The following update was provided by Drs. Pat Phipps and Darcy Telenko at the Virginia Tech Tidewater Ag Research and Extension Center (Suffolk, VA). Most full season (May planted) soybeans (group IV and V) are at or approaching R6 (full seed). Group III soybean are beginning to yellow and drop leaves. Therefore, most of our full-season crop should suffer no yield loss from soybean rust. Double-crop soybean are just entering R5 (beginning seed); therefore, this crop will need to be protected for approximately 2 more weeks. In drought-stricken areas, recent rainfall has allowed addition flowering and pod set at the top of the plant. In the most severely drought-stressed areas of Virginia, soybean are one to two stages behind. Such fields will need protection for another 2 weeks. Observation and Outlook - Disease Samples of leaflets from sentinel plots at the Tidewater AREC in Suffolk have been examined this week and no soybean rust (SBR) was found. The risk of SBR reaching Virginia is likely to remain low as long as high temperatures continue to reach into the 90's. |
| Aug-27-2010 General Comments (Other) From Sean Malone |
Tour Announcement--Tidewater AREC Late-Season Field Crops Tour--Sept. 14, 2010 @ 2 pm We will be hosting the 2010 Late-Season Field Crops Tour at the Virginia Tech Tidewater Agricultural Research and Extension Center on Tuesday, September 14, 2010. Registration begins at 1:30 pm at the RESEARCH FARM (1045 Hare Road, Suffolk, VA); the tour will start at 2:00 pm. Pre-registration is required for the tour/dinner (please see the attachment for more details on pre-registration procedures and the planned topics). If you are a person with a disability and desire any assistive devices, services or other accommodations to participate in this activity, please contact the Tidewater Agricultural Research and Extension Center at 757-657-6450 (TDD number is 800-828-1120) during business hours of 8 a.m. and 4:30 p.m. to discuss accommodations five days prior to the event. [More] |
| Aug-26-2010 Fruits and Vegetables (General) (Insect) From Tom Kuhar |
Eastern Shore Insect Pest Activity for Week ending Aug 26 Click More to view the insect trap counts for various locations on the Eastern Shore of Virginia. Current counts as well as those from previous weeks are included. In summary corn earworm moth activity remains high in Eastville and Melf according to pheromone trap catches of approximately 50 moths per week. Beet armyworm moth activity is also peaking especially in Eastville. Concomitant to this moth activity, we have been experiencing these pest larvae in multiple crops including soybeans, green beans, peppers, and tomatoes. Growers and crop consultants should still carefully monitor crops for these pests even if they have been sprayed previously. [More] |
| Aug-26-2010 Fruits and Vegetables (General) (Insect) From Tom Kuhar |
Eastern Shore Insect Pest Activity for Week ending Aug 26 Click More to view the insect trap counts for various locations on the Eastern Shore of Virginia. Current counts as well as those from previous weeks are included. In summary corn earworm moth activity remains high in Eastville and Melf according to pheromone trap catches of approximately 50 moths per week. Beet armyworm moth activity is also peaking especially in Eastville. Concomitant to this moth activity, we have been experiencing these pest larvae in multiple crops including soybeans, green beans, peppers, and tomatoes. Growers and crop consultants should still carefully monitor crops for these pests even if they have been sprayed previously. [More] |
| Aug-26-2010 Soybean (Insect) From Ames Herbert |
Corn earworms, loopers, green cloverworms and more in soybeans Although the corn earworm flight is still strong, we are not hearing of many fields with high numbers of worms. However, we are hearing of a lot of fields with pod-stage thresholds and many are being re-sprayed. Several folks have reported seeing newly hatched small worms but are waiting a few days before spraying to see how things develop. Holding off a few more days may mean the difference in having to treat a third time. There are a lot of fields that seem to be holding with no new earworms developing, especially the early planted fields. More infestations are being reported in later-planted double crop fields. This is a typical pattern as the pods in early planted fields are getting to the point where they are no longer attractive or vulnerable. Maybe this second infestation will not be as bad as we expected, but we have another week or two before we will know. Our advice is to keep checking fields at least every 5 days or so, until fields reach the R7 growth stage. As a side note, our pyrethroid testing of adult corn earworms is showing a gradual increase in the level of survivorship, now averaging over 40% for this past week (see the attached figure). Better consider one of the non-pyrethroid options. We are finding (and hearing about) more soybean loopers. The most we have encountered is about 15 to 20 per 15 sweeps, but even at those numbers, the level of defoliation is not bad or to the point where fields need protection. This may get worse, or may not, depending on a lot of factors. One of the oddest situations is the extremely large numbers of green cloverworms that are being reported in some areas. Folks are finding 30-40 and more per 15 sweeps and they are definitely working on the foliage. We always see cloverworms in soybean fields but never at these high levels. They are having to be controlled in fields with limited growth (due to slow growth during the hot dry weather). Reports from Maryland are saying that brown marmorated stink bugs are inundating soybean fields in western and central Maryland. We have known about this pest for several years. It is a native of China, was first reported in Virginia in 2005 (one specimen) and has gradually increased in number. It has become established in Virginia and is now causing problems in vegetable a fruit crops. Soybean is one of its many host crops in China and as we feared, it is now moving into that crop. We have found a few in Virginia soybean fields, about 1 per 15 sweeps in a couple of fields. We do not know much about damage potential or control options but a lot of research is underway. [More] |
| Aug-26-2010 General Comments (Insect) From Sean Malone |
Corn earworm moth black light trap captures for week ending 26 August Mean nightly corn earworm moth captures for 20-26 August 2010 were as follows: Petersburg (34), Prince George-Wells (10), Prince George-Lipchak (50), Southampton (68), Suffolk (18), Sussex (18), Essex (5), Northumberland (16), Richmond County (28). Please see the attached table for more information. [More] |
| Aug-26-2010 Soybean (Insect) From Sean Malone |
An update of the soybean aphid and brown marmorated stink bug monitoring program For August 16-19, Ed Seymore reported that surveyed fields in the following counties had little to no soybean aphids, with the exception of Gloucester in the Wood's X area: Augusta (0), Albemarle (0), Buckingham (0), Caroline (1-5), Charles City (0), Clark (1-5), Culpeper/Fauquier (6-39) aphids/plant), Gloucester (150-249), Goochland (0), Henrico (0), King and Queen (0), King William (0), Lancaster (0), Mathews (1-5), Middlesex (0), Rockingham (0), and Shenandoah (0). The economic threshold for soybean aphid is 250 aphids/plant. Under ideal conditions, soybean aphid populations can double every 2 days. Very low numbers (about 1 per 15 sweeps) of brown marmorated stink bugs were detected in one soybean field in central Culpeper County. |