May 18, 2018

NYS IPM Weekly Field Crops Report-May 18, 2018

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View from the Field

Alfalfa Weevil

There is very little pest activity with field crops this week. Mike Stanyard (CCE Northwest NY Dairy and Field Crops Team) and Aaron Gabriel (CCE Capital District) report minor alfalfa weevil feeding on alfalfa.

IPM for Alfalfa Weevil on Alfalfa

Small Grain Diseases

Currently, small grains are reporting low to no disease issues so far this season.  Dr. Gary Bergstrom (Cornell University Field Crops Plant Pathologist) will be posting the fusarium head blight (scab) update this weekend. You can check for the risk for fusarium head blight at the Fusarium head blight prediction center Currently, most of New York is at low risk with the exception of the area of NY that borders Pennsylvania and New Jersey is at high risk for winter wheat.  The lower and mid-Hudson Valley is also at medium to high risk for  Fusarium head blight for winter wheat according to the prediction center model.

Black Cutworm and True Armyworm

 Black cutworm moths captures in our pheromone trapping network remain low. We have not yet caught any true armyworm moths. With recent weather fronts might have brought more moths to NY. Be on the watch for this pest in your small grains and corn.

IPM for Black Cutworm in Field Corn

Weather Outlook – May 17, 2018

Jessica Spaccio

NOAA Northeast Regional Climate Center

Last week temperatures ranged from near-normal to 4 degrees above normal. Precipitation has ranged from a trace to over two inches. Base 50 growing degree-days ranged from 20-80.

Dry on Thursday, showers and thunderstorms Friday evening into the weekend with heavy rain possible on Saturday.

Today temperatures will be in the upper 60’s to 70’s with clearing skies and dry conditions thanks to high pressure. Overnight lows will be in the low 40’s to low 50’s.

Friday temperatures will be in the 60’s with scattered showers beginning in the eventing. Overnight temperatures will be in the 40’s to low 50’s with showers continuing to move into the state.

Saturday will be rainy with thunderstorms possible (marginal risk for severe in western southern tier) and temperatures in the mid 50’s to 60’s; locally heavy rainfall is possible. Overnight temperatures will be in the 50’s with scattered showers continuing.

Sunday will have highs in the 70’s with occasional light showers but a mostly dry day. Overnight temperatures will be in the 50’s.

Monday a few showers are possible with highs in the upper 60’s to to mid 70’s. Lows will be in the mid 40’s to mid 50’s.

Tuesday will have highs in the upper 60’s to mid 70’s with scattered showers and thunderstorms.  Lows will be in the upper 40’s to low 50’s.

Wednesday, temperatures will be in the 70’s.  Lows will be in the upper 40’s to low 50’s.

The seven-day precipitation amounts will range from ¾ inch to 2 inches.

The 8-14 day outlook (May 24-30) favors above-normal temperatures and below-normal precipitation for the state.

Maps of 8-14 day outlooks:

National Weather Service watch/warnings map:

US Drought Monitor

CLIMOD2 (NRCC data interface):

 New York Field Crop Pest Degree Day Accumulations for selected locations

(May 18, 2018)

Station Location

Alfalfa Weevil

(Base 48)

March 1

GDDs (Base 50 F)

March 1

Seed Corn Maggot (base 39)

January 1

Black Cutworm (Base 50)

April 24

Ceres 241 196 573 179
Chazy 177 137 438 137
Geneva 258 209 594 208
Highland 327 275 760 264
Ithaca 256 210 608 204
Massena 191 151 452 151
Valatie 277 232 641 226
Versailles 246 205 610 198
Watertown 177 141 457 141


Alfalfa Weevil Degree Day Model

Accumulated Degree Days for Peak Occurrence

(50%) of Alfalfa Weevil at a given Life Stages

Stage              Degree Days

Egg hatch                    280 DD

Instar 1                        315 DD

Instar 2                        395 DD

Instar 3                        470 DD

Instar 4                        550 DD

Cocooning                   600 DD

Pupa                            725 DD

Adult emergence         815 DD

Source: Growing Alfalfa the IPM Way-NYS IPM

Seed Corn Maggot Degree Days Model

Base Temp = 390 F Peak 1st Generation Seed Corn Maggot fly Free degree days Peak 2nd Generation Seed Corn Maggot fly Free degree days Peak 3rd Generation Seed Corn Maggot fly Free degree days
degree days 360 810 1,080 1530 1800 2250

Source: Insect IPM for Organic Field Crops: Seed Corn Maggot by Katelin Holm and Eileen Cullen

Black Cutworm Degree Day Model

Black Cutworm Degree Days Model

Degree Days Stage Feeding Activity
0 Moth Capture Egg Laying
90 Eggs Hatch
91-311 1st to 3rd Instar Leaf Feeding
312-364 4th Instar Cutting Begins
365-430 5th Instar Cutting Begins
431-640 6th Instar Cutting Slows
641-989 Pupa No feeding

Source: University of Minnesota Black Cutworm Trapping Network

 Clipboard Checklist

Keith Waldron, NYS IPM


*Walk fields to check tile flow, check and clear drainage outlets. Look for line breaks
*Note and record location of wet areas on field maps or aerial photo for future tiling considerations and crop decisions, check for areas of soil erosion
*Pre-plant weed evaluation, timing cultivation and/or pre-plant weed management
*Watch for early season weeds: winter annuals, chickweed, henbit, field penny cress, shepherd’s purse, giant and common ragweed, purple deadnettle, lambsquarters, redroot pigweed, velvet leaf, Pennsylvania smartweed, common sunflower, quackgrass, foxtail

*Evaluate established legume stands for winter damage (thinning stand, frost heave, Brown root rot), determine average alfalfa stand count adjust crop plans if necessary
*Monitor for alfalfa weevil, crown or foliar diseases
*Monitor new seedings for Pythium blight and Phytopthora Root Rot.
*Monitor for Alfalfa Snout Beetle (In Oswego, Jefferson, Cayuga, Wayne, Lewis, St. Lawrence, Clinton, Essex, and Franklin counties)

Small Grains:
*Monitor winter grain fields for over wintering survival (snow mold and other cold injury issues), weed issues (such, as winter annuals, corn chamomile and chickweed), growth stage, number of tillers, foliar diseases (powdery mildew, rusts)
*Check stands for soilborne virus diseases, Wheat spindle streak mosaic and Soilborne wheat mosaic, check for signs of powdery mildew or other maladies, cereal leaf beetle, weed escapes, goose damage

*Prepare land and plant corn as conditions allow
*Pre-plant weed evaluation, timing cultivation and/or pre-plant weed management

*Emergence: assess stand, population count

*Prepare land and plant soybeans as conditions allow
*Pre-plant weed evaluation, timing cultivation and/or pre-plant weed management

Check and mend fences as needed.
*Check crop growth
*Monitor fields for invasive species, plants harmful to livestock
*Review/Plan rotation system

*Remove / clean soil and crop debris from equipment
Arrange for custom weed control or check your own application or cultivator equipment for repairs.
*Carry appropriate / necessary NYS DEC and EPA required documents: (pesticide applicators license, pesticide labels, MSDS sheets, etc.) with application equipment

-planting equipment – maintain records on planting rate per field

-manure spreaders – maintain records on amount spread per field

-pesticide application equipment – Check nozzles, pumps, etc., recalibrate pesticide application equipment before use.

* Check stored grain bins for temperature, moisture and signs of mold and insects. Aerate, core, transfer grain or treat as necessary
Check forage allocation and anticipate feed program adjustments as forages from previous year are used up
*Plan where forages should be stored for optimum allocation next feeding season