2 edition of European corn borer and corn leaf aphid resistance in corn hybrids found in the catalog.
European corn borer and corn leaf aphid resistance in corn hybrids
B. D. Barry
|Statement||B. Dean Barry|
|Series||Research circular / Ohio Agricultural Research and Development Center -- 174, Research circular (Ohio Agricultural Research and Development Center) -- 174|
|The Physical Object|
|Pagination||7 p. ;|
The survival of KS-SC DiPel-resistant and -susceptible European corn borer, Ostrinia nubilalis (Hübner), was evaluated on different tissues from corn, Zea mays L., hybrids, including a nontransgenic and two transgenic corn plants (events MON and Bt11) expressing high doses of Bacillus thuringiensis (Bt) Cry1Ab. The survival of Bt-resistant and -susceptible third instars was similar after a. European corn borer development rapidly slows in the summer when temperatures exceed 85 degrees Fahrenheit. Figure 1 European corn borer mothk, left, and egg mass, right. Harold Stockdale photo Damage. Corn (field) First-generation European corn borer larvae can damage leaves by removing a thin, transparent layer, or "windowpane," of tissue.
European corn borer Scientific name—Ostrinia nubilalis Appearance Full-grown larvae of the European corn borer range in length from 3⁄4 to 1 inch and vary in color from gray to creamy white. The body is covered with numerous dark spots and the head is black. Adults are straw-colored moths with a 1-inch wingspread. Male moths are slightly. European Corn Borer Resistant Corn is genetically engineered Bt has been genetically engineered to produce an insecticidal protein that is naturally made by a bacteria called Bacillus thuringiensis (Bt), in every cell of the plant. The Bt protein the corn produces kills lepidopteran insects, including the European corn r, by , pests evolved resistance to Bt.
Northern corn leaf spot caused by the fungus Cochliobolus carbonum has become more prevalent with the greater use of no-till systems. Although there are several races of the fungus that cause disease, Race 3 most likely causes the greatest impact in New York State. Northern corn leaf spot is favored by high humidity and warm weather. Hybrids were selected to represent contrasting leaf types: Pioneer® PAM™ brand corn had more upright leaves than Pioneer® PAMXT™ brand corn in research. Leaf Measurements Leaf orientation measurements were taken on the 2nd, 6th, 10th, and 14th leaf of 10 plants in each plot.
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Entomologists at the University of Guelph in Canada have confirmed European corn borer resistance to Cry1F Bt trait (Herculex 1) in is the first case of European corn borer resistance to any type of Bt corn. The registrant for the trait independently confirmed the results from additional field locations.
By repeatedly exposing a lab colony of European corn borers to Bt, researchers at the University of Minnesota already have created a population of corn borers that is resistant to Bt. If Bt -corn hybrids are planted widely, European corn borer populations eventually will develop resistance to this very specific insect toxin.
Historically, the major corn insect pests in South Dakota have been northern and western corn rootworm, European corn borer and black cutworm. Bt-corn hybrids are effective against most of these pests.
However, there are also minor or sporadic pests of corn in South Dakota including the bird cherry oat aphid, corn leaf aphid, fall armyworm File Size: 5MB. Corn leaf aphid No control Less insecticide use may reduce aphid activity. Corn earworm Control Control with Cry1F and VIP3Aa Cutworms Variable Cry1F and VIP3Aa20 events effective against black cutworm.
Data lacking on other species. European corn borer Control No control with single events targeting corn rootworm or VIP3AaFile Size: KB. Broken leaf midribs, tassels with saw-dust-like frass at the breaks, and holes in the stalks and ears with bunches of frass at the tunnel openings are common signs of the European corn borer.
This damage can lead to reduced yield, lodging, and dropped ears, and the borings. Corn borers can attack corn planted at any time, but usually first generation damage can be worse in early planted corn and late planted corn is more severely damaged by second generation European corn borer and southwestern corn borer as well as corn earworm, fall armyworm, and black cutworm.
Corn Leaf Aphids Cereal Aphids NebGuide Identification and general discussion of the cereal aphid species most commonly found in Nebraska small grains, corn, sorghum and millet.
Description: Small blue/green, usually wingless insects in the whorl and tassel. Damage Symptoms: Feeds by sucking juices from corn plant; does not inject salivary toxins. In the past, corn leaf aphid could be a problem during corn tasseling. This species aggregated around the ear and silks, and sometimes their honeydew production interfered with pollination.
But natural enemies and the environment rarely let them persist past July. Therefore, economic thresholds for corn leaf aphid are targeted around VT-R1 and mostly for drought-stressed. In contrast, the European corn borer developed resistance to transgenic corn much sooner when the refuge was sprayed once per year, and the time to 3% resistance allele frequency decreased as.
Most seed corn companies have hybrids with some type of resistance to leaf feeding caused by the European corn r, since the late 's, fewer acres have been planted to these hybrids.
The inbred line B73, which is widely used in hybrid combinations because of its high yield potential, also is susceptible to corn borer feeding. The European corn borer originated in Eurasia and was accidentally introduced into North America.
This insect readily adopted corn as a host and has since caused hundreds of millions of dollars in crop losses. This publication is an update of the version published by the North Central Region.
susceptibility to the corn leaf aphid. The purpose of this paper is twofold: (1) To present data showing relations between the suscepti- bility of corn hybrids to aphid and to borer injury and, on the basis of these relations, (2) to suggest a new technique for evaluating susceptibility of hybrids to corn borer.
Host Plants – The European corn borer infests over plants, but corn is a preferred host. Other vegetable crops likely to be injured include bean, beet, celery, potato, pepper, and tomato. Other vegetable crops likely to be injured include bean, beet, celery, potato, pepper, and tomato.
European corn borer is a serious threat to corn every year. With resistance on the rise, find out how you can protect your crops from Pioneer Field Agronomist Paul Yoder. How To Control the European Corn Borer. The European Corn Borer (Ostrinia nubilalis) is a widespread pest (found on three continents) known to feed on different kinds of plants, some of which include: corn, pepper, chrysanthemum, dahlia, beet, bean, potato, tomato, cotton and soybean along with many kinds of weeds.
Adults are small, tan, nocturnal moths. Yield losses due to second-generation European corn borer (ECB), Ostrinia nubilalis (Hübner), infestations in long-season maize, Zea mays L., hybrids (B79 × Mol7 and Pioneer ) planted early. Corn rootworm. Corn rootworms are adaptive, changing to meet shifting production practices, technology, and climate.
With the development of resistance to Bt-rootworm corn, corn rootworms now pose a challenge for most corn growers. European corn borer is able to feed on most plants with fleshy parts or stems Broadleaf and grassy weeds Other crops: soybeans, peppers, tomatoes, strawberries, etc.
The European corn borer lives and feeds primarily on field corn, but also eats sweet corn, popcorn, and seed corn. The first generation of corn borers which develops during the late spring feeds on the leaves and stalks of corn plants.
In addition, the second generation feeds on the ear of corn, the leaf sheath, and the ear shank. There were important differences in the resistance offered by the different Bt event corn hybrids. Hybrid comparison tests indicate that these Dipel-resistant first-instar European corn borer were not able to survive to adulthood on whorl-stage MON, Bt11, or Bt event corn plants.
The European corn borer (Ostrinia nubilalis), also known as the European corn worm or European high-flyer, is a moth of the family Crambidae which includes other grass moths. It is a pest of grain, particularly corn (maize or Zea mays).The insect is native to Europe, originally infesting varieties of millet, including broom European corn borer was first reported in North America in.Introduced into North America, the European corn borer (ECB) probably came in "broom" corn from Hungary or Italy around It was first identified in Massachusetts in from where it spread west to Nebraska in as a two-year generation ('bivoltine') strain.
Corn is its preferred or primary host but it can infest some plants including dry bean, soybean, and.The corn leaf aphid, Rhopalosiphum maidis, is the most common aphid found on North Dakota corn but is only an occasional pest.
The European corn borer, Ostrinia nubilalis, is a consistent pest. Because both the univoltine and bivoltine variants of the European corn borer are present they are difficult to control using conventional methods.