Last edited by Mazudal
Friday, May 15, 2020 | History

2 edition of Silking of sweet corn as a factor in corn earworm control found in the catalog.

Silking of sweet corn as a factor in corn earworm control

L. H Rolston

Silking of sweet corn as a factor in corn earworm control

by L. H Rolston

  • 189 Want to read
  • 21 Currently reading

Published by Ohio Agricultural Experiment Station in Wooster, Ohio .
Written in English

    Subjects:
  • Corn -- Diseases and pests -- Control,
  • Helicoverpa armigera

  • Edition Notes

    Cover title

    StatementL.H. Rolston, Charles King
    SeriesResearch circular / Ohio Agricultural Experiment Station -- 48, Research circular (Ohio Agricultural Experiment Station) -- 48
    ContributionsKing, Charles
    The Physical Object
    Pagination11 p. :
    Number of Pages11
    ID Numbers
    Open LibraryOL15239857M

    European corn borer: There was no feeding injury over the 15% control threshold on pre-tassel corn this week. Very few moths were caught in traps, and were not over the threshold for silking corn at any of our sites. Corn earworm: Moth catches continue to be high at most locations, posing a significant threat to all fresh, silking corn. A six. Fresh sweet corn is one of the best tastes of the summer. Put a little butter on an ear and chomp away! The only thing that ruins this experience is when you open up the husks and find a worm inside. We have tools to control earworms and borers.

    Processing varieties of the transgenic Bt sweet corn are now being grown commercially, and sh 2 varieties are being tested. References: Prostak, D. J. Corn earworm. Pp In Adams, R. G. and J. C. Clark (eds). Northeast Sweet Corn Production and IPM Manual. University of Connecticut, Resource Center U, Storrs Rd.,Storrs, CT   The developers of Bt sweet corn should consider pyramiding another protein, perhaps Cry1 F or VIP3A, to obtain control of this emerging pest in sweet corn, as has been done in field corn. Performance Series sweet corn varieties captured an estimated 5–10% of the total fresh market sweet corn market in the United States during its first year.

    Corn Earworm Control Study — Vince Lawson and Henry G. Taber ISU Muscatine Island Research Farm, Fruitland, Iowa Introduction Sweet corn growers frequently have to apply four to six insecticide sprays during the corn silking period to achieve the clean, worm-free, ears demanded by consumers. Insecticides in the. the attractiveness of dent corn to earworm moths for egg laying has a major influence on how susceptible sweet corn is to earworm damage. Early in the season, before the neighboring dent corn begins to silk, insecticides should be applied to sweet corn when fresh silks are present and 1 moth per night is being caught in the pheromone trap. In.


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Silking of sweet corn as a factor in corn earworm control by L. H Rolston Download PDF EPUB FB2

Currently, the primary insecticides used for corn earworm control in sweet corn belong to the pyrethroid class. There is growing concern that corn earworm in some regions of the Midwest has developed resistance to this class of insecticides. Some field failures have been reported.

Figure 1. A young corn earworm larva feeding on a tip of an ear. 11 Warrior II 3d interval 50% tassel 25% dry silk fl oz/acre 12 Warrior II 5d interval 50% tassel 25% dry silk fl oz/acre 13 Untreated - - - - Table 1.

Various insecticide by application timing strategies evaluated for control of corn earworm in sweet corn in Geneva, NY in Trapping moths is a critical IPM tool for monitoring corn earworm flight activity. Either blacklight or pheromone traps baited with corn earworm lures can be used.

Blacklight traps can be placed near corn fields, but not necessarily in them, and give a reasonable estimate of populations up to one mile away from fields. Corn earworm (CEW) is a serious pest of sweet corn that requires some control measures to have saleable ears.

Control measures range from cutting the infected tips off to spraying times with synthetic insecticides during silking.

Several options work, and how you intend to market your sweet corn will determine which system you Size: 6KB. Insecticides for Earworms in Sweet Corn. If shucking the husks from your home-grown sweet corn (Zea mays) reveals ears with chewed, brown tips, corn earworms (Helicoverpa zea) have already sampled.

REI 4 hr. Do not exceed lb ai/a per year ( lb ai/a per year if used for livestock feed). Some formulations are OMRI-listed for organic use. For corn earworm at silking, applications may be made at 1- to 2-day intervals if necessary, but do not make more than.

Full text of "Mineral-oil treatment of sweet corn for earworm control" See other formats Historic, archived document Do not assume content reflects current scientific knowledge, policies, or practices c Circular no. August • Washington, D. UNITED STATES DEPARTMENT OF AGRICULTURE Mineral-Oil Treatment of Sweet Corn for Ear worm Control 1 By George W.

Barber, entomologist. The corn earworm (Heliothis zea), is the larva of a dark-brown or olive-green, night-flying moth. When fully grown, earworm caterpillars are over 1 inch long.

These larvae have a creamy yellow or black stripe down their side, and they’re most often found curled into a C-shape and feeding just at the base of the silks on an ear of corn. Silking of sweet corn as a factor in corn earworm control (Research circular / Ohio Agricultural Experiment Station) by L.

H Rolston | 1 Jan Unknown Binding. sweet corn • If corn earworm pressure low – No insecticide sprays needed during silking • If corn earworm pressure moderate or high – Use 2 sprays – First spray: 75% fresh silk.

Corn earworm moths are attracted to green silks of any corn for egglaying. The delay of silking in grain corn and in some cases the absence of grain corn locally has likely increased pressure on what corn is silking, including sweet corn. The biology of this pest makes management a challenge. •When eggs hatch, larvae crawl down silk into the ear tip •Larvae do little or no feeding until they are inside the tip of the ear earworm control than a boom sprayer without drop nozzles Microsoft PowerPoint - Update on Corn Earworm Management in Sweet Corn.

Once corn earworm is detected, silking sweet corn should be sprayed with insecticide every days. The choice of an appropriate spray interval is as important as the choice of product to use. Details about the most appropriate spray interval based on pheromone traps are shown in the chart below.

OF EARs EXAMINED IN A CORN EARWORM CONTROL EXPERIMENT ON SWEET CORN. Number of ears per plot 25 1 50 Treatment F Value (d.f. = 15 & 45) (NS) ** Coefficient of variation Lowest significant difference by the Multiple Range Test 1 Average of two analyses.

Corn earworm moths are attracted to green silks of any corn for egglaying. The delay of silking in grain corn and in some cases the absence of grain corn locally has likely increased pressure on what corn is silking, including sweet corn.

The biology of this pest makes management a challenge. Corn Earworm (Helicoverpa zea) Insect Fact Sheetintegrated pest management Description Life Cycle Injury. Corn earworm larva Corn earworm adult Corn earworm eggs. University of Illinois.

The corn earworm, also known as the tomato fruitworm and the cotton bollworm, feeds on a number of crops including corn, tomato, cotton, green beans, clover, vetch, lettuce, peppers, soybeans, and sorghum. With most sweet corn hybrids, insecticide applications need to begin when 30% to 50% of plants are showing silks and CEW moths are present at levels above the action threshold (Table 1).

1,9 Recommended threshold levels vary somewhat among regional production guides 1,9, and thresholds should be adjusted based on temperature and the presence of silking field corn. Considering EVERY buyer of sweet corn from my farms asks if it is GMO, sweet corn can NOT be grown if it is genetically modified and then sold by the farmer.

It is just too risky. We are still using silencer, Lambda Cyhalothrin, and usually spray each crop four times, but only at silk.

Insecticides for Commercial Corn Earworm Control in Sweet Corn Pesticide and Formulation Amount in Gallons Water/Acre Harvest Restrictions Remarks esfenvalerate (Asana XL) EC fl. 1 day Plant as early as possible.

Late-planted corn may be damaged severely. If silking occurs after July 1, apply insecticides every other. The corn earworm (Helicoverpa zea Boddie) is a common insect in corn. First and second generation caterpillars attack the whorl stage while the later generations are largely found in corn ears.

Corn earworm larvae generally infest the ear through the silk and in years with heavy insect pressure, there can be multiple penetration sites. Earworm control in corn is a concern of both small and large scale gardeners. The Heliothus zea has the distinction of being the most destructive corn pest in the United States.

Thousands of acres are lost each year to the larvae of this moth and many home gardeners have been discouraged by its damage.Chemical control of the corn earworm can be expensive; most spraying occurs in sweet corn fields where a majority of the market value is in the quality ofthe ears.

Since larvae move down the silk channels as soon as they hatch, the timing of insecticide applications is very important.Growing sweet corn in a home garden is a hobby that many people enjoy during the summer months.

Sweet corn can be infested with wireworms, European corn borers, flea beetles, fall armyworms, corn earworms, Japanese beetles and sap beetles. Choosing the best insecticide for your crop will help to.