Vegetable Crop Insects -
Continue to sample fields for diamondback, cabbage looper, fall armyworm and beet armyworm. A treatment should be considered if you find 5% of the plants infested and before larvae move into the hearts of the plants.
Lima beans continue to be attractive to corn earworm moths. A treatment will be needed if you find one corn earworm larvae per 6 ft of row. Consultants are also reporting higher levels of soybean loopers as well as cabbage loopers. Both insects are migratory pests. Although we usually find loopers each year, this is the first year that they are seeing significant damage to foliage and pods. Since soybean loopers are difficult to control and pyrethroid resistance has been documented in southern states, you may want to consider an application of Lannate LV at a rate of 2.5 to 3 pints/acre for looper control. At the higher rates, the REI for Lannate is 3 days to harvest.
Be sure to maintain a 5-7 day spray schedule for corn borer, corn earworm, beet armyworm and fall armyworm control. We are starting to see an increase in aphid populations so be sure to also sample for this insect pest. If aphids are present and leaves are not curling, Lannate at 1.5 pt/A (3 days to harvest) should provide control. Actara (0 days to harvest), Assail (7 days to harvest), Fulfill (0 days to harvest), and Provado (0 days to harvest) will also provide aphid control. A penetrating surfactant should be used with Fulfill.
Continue to spray snap beans from the bud stage through harvest for corn borer and corn earworm control. On processing beans, Orthene should be applied at the bud and pin stages for corn borer control. However, since Orthene provides poor corn earworm control, a pyrethroid plus Orthene should be used at the pin spray to achieve corn borer and corn earworm control. Remember, Orthene has a 14 day pre-harvest interval. After the pin spray, be sure to check local trap catches to determine the spray interval for your area. You can check our website for the most recent trap catches and information on how to use this information to make a treatment decision in processing snap beans.
The first webworms and beet armyworms can be found in recently emerged plants. As a general guideline, controls should be applied when 5% of the plants are infested with small worms and before they have moved deep into the hearts of the plants. Also, remember that both insects can produce webbing on the plants. Since beet armyworms are more difficult to control, chemical selection is important. Confirm, Intrepid or Spintor will be needed for beet armyworm control. If webworms are the predominant species, permethrin, Confirm (8 oz/acre), or Intrepid (8-10 oz) should be used. Generally, at least 2 applications are needed to achieve control of webworms and beet armyworm.
All fresh market silking sweet corn should be sprayed on a 2-3 day schedule.
Field Crop Insects -
Continue to scout fields for soybean aphids. Although, we are starting to see an increase in predator and parasite populations, we have not seen enough activity to crash populations. Weather conditions remain favorable for aphid increases. Be sure to look at the entire plant when sampling for aphids. The fields at the highest risk are double crop fields as they are in the most susceptible stage, R1 to R3-R4. Thresholds are 250/plant if plants are in the R1 to R3-4 stages. After that, the number goes to 1000-2000/plant. It is important to note that the thresholds from R4 to R5 have not been as clearly defined – the important thing to consider is whether the populations are increasing or decreasing. In the
Corn earworm levels remain low throughout the region. We can still find a few larvae but numbers are well below threshold. The latest planted fields with blossoms and open canopies will be attractive to egg laying moths. So, if you have not scouted your fields be sure to look for corn earworms until mid-September.
Since corn harvest has been earlier this year, we have received questions about earlier planting of small grains. Although we have not seen widespread Hessian fly problems for a few years, we continue to see isolated fields with problems. In most cases, damage has been the result of spring infestations. Plants attacked in the spring have shortened and weakened stems that may eventually break just above the first or second node, causing plants to lodge near harvest. Since the fly survives as puparia ("flax seeds") in wheat stubble through the summer, you should still consider this pest as you make plans to plant small grains. In some cases, infested fields were planted after the fly free date. This traditional method of control is based on delaying planting until after flies have emerged. Warm fall weather conditions can extend fly emergence and egg laying beyond the fly-free dates, but these dates should still be used as a guideline for planting. Since we rarely see plants stunted in the fall, we still feel that most of the damage we see is occurring from spring infestations. Plants attacked in the fall at the one-leaf stage may be killed outright. Wheat attacked later in the fall will be severely stunted, with the first tillers killed and plant growth delayed. Plants infested in the fall can easily be recognized by their darker than normal bluish coloration and leaves with unusually broad blades. A combination of strategies should be used to reduce problems from Hessian fly:
(1) Be sure to completely plow under infested wheat stubble to prevent flies from emerging.
(2) Avoid planting wheat into last season's wheat stubble, especially if it was infested with Hessian fly.
(3) Avoid planting wheat next to last season's wheat fields - the most serious infestations can occur when wheat is early planted into wheat stubble or into fields next to wheat stubble.
(4) Eliminate volunteer wheat before planting to prevent early egg laying.
(5) Do not use wheat as a fall cover crop near fields with infestations.
When possible, plant after the fly free date.
(Oct 3 –
Plant resistant varieties. You should
look for varieties that have resistance to Biotype L. Although some of these varieties may not be
far as chemical control, most of the recent data with seed treatments and
foliar insecticides has come from
Grain Marketing Highlights - Carl German, Extension Crops Marketing Specialist; email@example.com
Pre-September Crop Report: Selected Comments.
USDA will release the September Crop Production Supply and Demand Report estimates tomorrow morning, Friday, September 10th. Average trade guesses for the September Crop Production report are:
U.S. Corn at 10.885 billion bushels, ranging from 10.717 to 11.270 billion bushels; U.S. Soybeans at 2.904 billion bushels, ranging from 2.846 to 3.087 billion bushels. In the August report, USDA estimated production at 10.923 billion bushels and 2.877 billion bushels, respectively.
Pre-report estimates for the '04/'05 marketing year ending stocks are: Corn average estimate at 1.141 billion bushels (1.040 to 1.242); Soybeans average estimate at 203 million bushels (175 to 253); All wheat average stocks estimate at 561 million bushels (531 to 578). In August USDA's ending stocks estimates were as follows: Corn 1.132 billion bushels; Soybeans 190 million bushels; and Wheat at 578 million bushels.
Commodity trading at the CBOT is being dominated by position squaring just ahead of the release of Friday morning’s September Crop Production Estimates.
The '04 harvest has gotten underway in the South and the
If the preliminary estimates are any indication, then the September Crop Report due out tomorrow morning isn't going to change things much from the current situation. The commodities market will continue to watch the impacts that weather developments have on harvest progress. A killing frost could still impact corn and soybean yields in the Northern tier of the
Commodity trading will now turn attention to demand events. Worth noting
is the high level of profits being earned in the pork industry. This factor along with the demand for other
red meats, and poultry is likely to keep feed demand growing in the coming
months. Also of interest is the pace at which ethanol production is growing.
The U.S. Energy Information Administration has announced the
Pole Bean Open House &
· Farmer Grant Application & Project Demonstration
· Pole Bean Diseases
· Heirloom Varieties Displayed
For more information, call 302-857-6424.
Programs should be mailed this week. We will again offer on-line registration. Although the site is currently under construction, it should be up and running by early next week. The website address for on-line registration and payment will be: https://crayola.hcs.udel.edu/conf/registration/crop_management/
For further information please contact Richard Taylor at 302-831-1383 or firstname.lastname@example.org
Week of September
0.08 inches: September 9
Highs Ranged from 82°F on September 9 to 76°F on September 5.
Lows Ranged from 71°F on September 8 to 60°F on September 5.
(Soil temperature taken at a 2 inch depth, under sod)
Web Address for the U of D Research & Education Center: http://www.rec.udel.edu
Compiled and Edited By:
Extension Associate – Vegetable Crops
Extension Education in Agriculture and Home Economics, University of Delaware,
Delaware State University and the United States Department of Agriculture
cooperating. Distributed in furtherance
of the Acts of Congress of May 8 and