Corn Pest Management Guidelines
UC agricultural management guidelines for control of corn pests. Corn Weed Photo Gallery, with Common and Scientific Names (1/06) Relative Toxicities of Insecticides and Miticides Used in Corn to Natural Enemies and Honey Bees (8/08) Bacterial ... [... more]
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Pathogen: Macrophomina phaseolini
Charcoal rot first becomes noticeable when corn is in the tassel stage or later. Infected stalks become shredded; the pith is completely rotted, leaving stringy vascular strands more or less intact. Small, black, spherical sclerotia of the fungus ... [... more]
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Corn leaf aphid: Rhopalosiphum maidis
Several species of aphids may be found in corn, but corn leaf aphid and greenbug are the primary aphid species infesting corn in California. Corn leaf aphids are small to medium and bluish green in color and also infest small grains. The greenbug ... [... more]
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Pathogen: Erwinia (Pectobacterium) spp.
Bacterial soft rot first appears as rapid desiccation of youngest leaves. A soft, watery rot of leaf tissue occurs inside the leaf whorl. The rot, which has an unpleasant odor, may kill the growing point of the plant. The disease is most commonly ... [... more]
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BEFORE PLANTING
COMMENTS: Apply after preirrigation and incorporate in top 2 inches of soil within 7 days of planting. COMMENTS: Do not rotate to any crop except corn or sorghum for 18 months after use. Band application can reduce carryover. Considered to be a ... [... more]
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Black cutworm : Agrotis ipsilon,
If the cutworm population is reducing the plant stand, treat during the seedling stage. Frequently, the damage is most serious at the edges of a field, but stand loss can occur in a spotty pattern throughout the field. Treatment of hot spots may ... [... more]
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Common Rust
Common rust causes pustules that may appear on any aboveground part of the corn plant but they are most abundant on leaves. The pustules, which may erupt and become powdery, occur nearly simultaneously on both leaf surfaces. They are golden brown ... [... more]
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Spotted cucumber beetle: Diabrotica undecimpunctata howardi
The western spotted cucumber beetle and the western striped cucumber beetle occur throughout California. The other two species occur primarily in southern California. Cucumber beetles (also called corn rootworm beetles) overwinter as adults and ... [... more]
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Seed Rots and Damping-off
UC Management Guidelines for Seed Rots and Damping-Off on Corn. Seed rot causes the corn seed to rot before germination and damping off causes the seedling to die soon after emergence. Infected tissue may be water-soaked (Pythium), white to pink ... [... more]
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Relative Toxicities of Insecticides and Miticides Used ...
Bacillus thuringiensis ssp. aizawaii Use lowest rates for best management of western predatory mite/spider mite ratio. Duration of impact to natural enemies 6 carbaryl (Sevin) carbaryl bait clothianidin (Poncho) narrow (caterpillars, thrips, ... [... more]
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BARNYARDGRASS AND VOLUNTEER CEREALS
Preplant incorporated herbicide options for the control of barnyardgrass include s-metolachlor (Dual Magnum), alachlor (Micro-Tech), and EPTC (Eradicane). In certain areas and soil types, pendimethalin (Prowl) can be applied to prevent any ... [... more]
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UC IPM: Susceptibility of Weeds to Herbicide Control in Corn
Johnsongrass (plant) ALA = alachlor* (Micro-Tech) ATR = atrazine* (AAtrex, etc.) DIC = dicamba* (Banvel, Clarity) DIF = diflufenzopyr (Distinct) EPT = EPTC (Eradicane) FOR = foramsulfuron (Option) GLY = glyphosate** (Roundup) MET = s-metolachlor ... [... more]
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