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Weekly Field Crops Pest Report 2011

September 16, 2011, Volume 10 Number 19

  1. View from the Field
  2. Weather Outlook
  3. Clipboard Checklist
  4. Contact Information

View from the Field

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I scouted a field in Sullivan County before a field day this week. The field had a lot of bird damage to corn ears. With some of the hybrids every ear of corn had extensive damage. Corn Ear Rots (molds) are the secondary pest of bird damage. Because the corn husks are pulled away ear it allows fungal pathogens to develop as seen in the photo below:

corn ear rot

Gary Bergstrom looked at this photo and thinks the pink mold is Gibberella ear rot.

Foliar diseases were present on the leaves. There was northern leaf spot (Bipolaris zeicola) and northern leaf blight (Exserohilum turcicum) infecting most of the leaves on the plants. Stalk rot was a problem in the field with several patches of corn that had lodged as seen in the following photos:

corn lodging

corn lodging

At the point where the corn had fallen over the inside of the stalk was brown. Gary Bergstrom thinks this might be anthracnose stalk rot.

Here are two articles I have prepared in past years related to stalk and corn ear rots you might find useful in identifying diseases this time of the year.

Check for Stalk Rots

Check for Corn Ear Rots

With the excess amount of moisture we have experienced, it would be a very good idea to check fields for disease. Conditions are ideal for disease development in corn.

Weather Outlook

September 15, 2011

Jessica Rennells
NOAA NE Climate Center, Cornell University

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Precipitation from Lee was a huge event for NY this past week and again devastating flooding occurred.  While the western and northern most edges of the state had less than half an inch, parts of central and eastern NY had over 7 inches, much within a 24-hour time period.   Temperatures were up to 6 degrees above normal.  The base 50 growing degree-days ranged from 75 to 125 for most of the state.

Today a cold front will bring noticeably cooler temperatures with highs only in the 50ís and rain likely, up to half an inch possible in areas.  Tonightís temperatures will be in the 30ís, making frost a concern.  Fog may develop and keep temperatures warmer and keep frost from forming.

Friday will only be slightly warmer with temperatures in the 50ís and reaching into the 60ís.  Lows will again be in the 30ís with frost likely for some areas.

Saturday high pressure will push temperatures into the low to mid 60ís with sunshine. Lows will be in the upper 30ís to mid 40ís.

Sunday temperatures will be in the mid to upper 60ís.  Lows will be in the mid 40ís.

Mondayís highs will be in the upper 60ís and low 70ís.  Lows will be in the mid 40ís to low 50ís.

Tuesdayís temperatures will be in the low 70ís with a slight chance of scattered showers.  Overnight temperatures will be in the upper 40ís to mid 50ís.

Wednesday will have highs in the low to mid 70ís with continues chance for light scattered showers.  Lows will be in the mid 50ís.

The five-day precipitation amounts will range from half only a tenth up an inch up to an inch.  The 8-14 day outlook is showing below normal temperatures for the eastern half of the state and unfortunately above normal precipitation for the whole state.  The three-month (Sept/Oct/Nov) outlook is showing above normal temperatures and no precipitation outlook yet.

Clipboard Checklist

Keith Waldron

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*Emergency contact information ("911", local hospital, Chem. Spill emergency contact, other?) posted in central posting area
*Maintain crop records by field, including variety, planting date, pesticides used, nutrient inputs including manure, etc.
*Watch for any patches of herbicide resistant weeds, weed escapes
*Storage areas cleaned and ready to accept hay, soybean, corn harvests

Field Corn:
* Note crop growth stage and condition Ė potential for silage harvest?
* Foliar diseases, stalk rots and ear mold
* Check for European corn borer, Western bean cutworm, foliar diseases (such as Gray Leaf spot and Northern Corn leaf blight), vertebrate injury (birds / deer), slugs, weed escapes, herbicide injury, nutritional deficiencies, etc.
* Monitor weed populations noting presence of "who", "how many" and "where"

Alfalfa & Hay:
* Monitor alfalfa seedings for weeds, for potato leafhopper & diseases.
* Check established alfalfa stands for potato leafhopper, weed and disease problems.
* Check established alfalfa stands for signs of alfalfa snout beetle infestations in counties known to have this pest.
* Storage areas cleaned and ready to accept next harvest?

* Note crop growth stage and condition
* Evaluate stand for deer, weed assessment, white mold, foliar disease incidence, harvest timing

Dairy Cattle: Livestock Barn Fly Management:
* Monitor animals and facilities for house fly and stable fly populations
* Check facilities for favorable fly breeding conditions: (organic matter + moisture): leaks in watering systems, roof gutters for leaks and potential overspill, drainage,
* Sanitation, sanitation, sanitation - clean animal resting areas, feed troughs, minimize source of moist organic matter i.e. fly breeding areas in barn and in adjacent animal loafing yard * Continue fly monitoring: install "3X5" index card fly speck monitoring cards throughout barn
* Use, replenish, replace fly management materials: sticky fly tapes/ribbons, insecticide baits, natural enemies (parasitoids), fly population monitoring (3 x 5) spot cards
* Continue release of purchased natural enemies (fly attacking parasitoids)

Dairy Cattle: Pasture Fly Management:
* Monitor animals for presence of face flies, horn flies and stable flies. Action guidelines: face flies (average 10 per animal face), horn flies (average 50 / dairy, 200 / beef cattle per animal side), stable flies average 10 per animal  (all four legs)
* Check feed bunk / water source locations for signs of stable fly breeding (moist undisturbed organic matter - spilled feed, round bales, etc.), minimize source of moist organic matter i.e. fly breeding areas in barn and in adjacent animal loafing yard
* Check paddocks for forage quality / quantity, rotate as appropriate
* Check paddocks for vegetation poisonous to livestock
* Consider use of fly traps to help reduce deer, horse and stable fly populations

* Pre-clean in and around grain storage bins in anticipation of soybean and grain corn harvests.
* Keep areas around storage bins and silos clean and mowed

* Note any repairs needed for recently used equipment: tractors, tillage implements, harvesting equipment, etc. as they are cleaned and serviced.
* Calibrate manure spreaders - maintain records on amount spread per field


Emergency responder information on pesticide spills and accidents CHEMTREC:  800-424-9300

For pesticide information:

National Pesticide Information Center: 800-858-7378

To Report Oil and Hazardous Material Spills in New York State: NYS Department of Environmental Conservation Spill Response: 800-457-7362 (in NYS); 518-457-7362 (outside NYS)

Poison Control Centers: Poison Control Centers nationwide: 800-222-1222

If you are unable to reach a Poison Control Center or obtain the information your doctor needs, the office of the NYS Pesticide Coordinator at Cornell University, 607-255-1866, may be able to assist you in obtaining such information.

Contact Information

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Keith Waldron: NYS Livestock and Field Crops IPM Coordinator
Phone: (315) 787 - 2432
Fax: (315) 787-2360

Ken Wise: Eastern NYS IPM Area Educator: Field Crops and Livestock
Phone: (518) 434-1690
Fax: (518) 426-3316