Cornell Small Grains Management Field Day at Poorman Farms in Seneca Falls on June 2.

You are invited to attend the Cornell Small Grains Management Field Day at Poorman Farms in Seneca Falls on June 2. Visit our website to view the agenda and pre-register (free)!

 

Alfalfa Weevil

Much of the alfalfa weevil issues across the state have been controlled with the first harvest of alfalfa. It does not mean to stop scouting for alfalfa weevils. This pest can be an issue in regrowth. The degree-day model for alfalfa weevil indicates we are at 1^st to 3^rd instar larvae. The warmer weather, coming this week will aid in the development of the weevil to the pupa stage more quickly. Once in the pupa stage, the weevil is done feeding for the season.

Alfalfa Weevil Pupa (Cocoon)

For more on alfalfa weevil please view the link to management information:

https://cals.cornell.edu/field-crops/forages/insects-forage-crops/alfalfa-weevil

 

Alfalfa Weevil Degree Day Accumulations from March 1 to May 29

Weather Station Location	Alfalfa Weevil	Life Stage
Arkport	372	Larvae Feeding 1st instar
Bergan	429	Larvae Feeding 2nd instar
Ceres	354	Larvae Feeding 1st instar
Conesus Lake	461	Larvae Feeding 2nd instar
Corwin	396	Larvae Feeding 2nd instar
Farmington	439	Larvae Feeding 2nd instar
Gansevoort	492	Larvae Feeding 3rd instar
Geneva	450	Larvae Feeding 2nd instar
Highland	543	Larvae Feeding 3rd instar
Ithaca	480	Larvae Feeding 3rd instar
Kinderhook	475	Larvae Feeding 3rd instar
Lafayette	466	Larvae Feeding 2nd instar
Laurens	343	Larvae Feeding 2nd instar
Malone	300	Egg hatching
Northport	542	Larvae Feeding 3rd instar
Peru	330	Larvae Feeding 1st instar
Red Hook	496	Larvae Feeding 3rd instar
Sherburne	341	Larvae Feeding 1st instar
Versailles	462	Larvae Feeding 2rd instar
Watertown	355	Larvae Feeding 3rd instar

 

Alfalfa Weevil Life Stage Development

Growing Degree Days for peak (50%) occurrence of stage

Stage of Life Cycle	Degree Days *
eggs hatch	280
Instar 1	315
Instar 2	395
Instar 3	470
Instar 4	550
Cocooning	600
Pupa	725
Adult Emergence	815

*48 degrees F base temperature

Fusarium head blight commentary, May 26, 2022:

Gary Bergstrom, Professor, Plant Pathology and Plant-Microbe Biology, Cornell University

The next several days are a critical fungicide spray decision time for winter wheat in New York. The majority of fields will initiate flowering during the early to middle portion of next week. The DMI (FRAC Group 3) containing fungicides Caramba, Prosaro, or Miravis Ace (latter includes a FRAC Group 7 fungicide) are the most effective fungicides for suppression of Fusarium head blight (FHB) and deoxynivalenol (DON) mycotoxin contamination when applied at flowering (emergence of yellow anthers on heads).  A flowering application of these fungicide products should be based on FHB risk as well as the risks of powdery mildew, rusts, and fungal leaf blotches in the upper canopy based on scouting of individual fields.   There is an application window of approximately 7 days from the beginning of flowering in which reasonable FHB and DON suppression can be expected.   Though the calculated risk of FHB infection has previously remained low, the risk level is expected to increase with widespread rain over the next few days. Check the Fusarium Risk Assessment Tool (http://www.wheatscab.psu.edu/ ) and your local weather forecast frequently as your winter wheat crop approaches flowering.  Most winter barley in New York is past growth stages when fungicide application should be considered.

 

Black cutworm and True Armyworm

There have been more intense catches for black cutworms with our field corn pheromone-trapping network in western and northern NY. You will likely start seeing cut plants if fields had an early infestation. It is best to start monitoring for black cutworm. We have not yet caught many armyworms, but it is a good idea to continue to scout for them. For management information, please view the following web pages.

Black Cutworm

https://cals.cornell.edu/field-crops/corn/insects-corn/cutworms

True Armyworm

https://cals.cornell.edu/field-crops/corn/insects-corn/armyworms

Interactive Map for Moth Capture of Black Cutworm and True Armyworm




 

 

Black Cutworm Degree Day Accumulations by Location

*Location for Intense Catches	Black Cutworm (Base 50)	Life Stage
Seneca Falls Seneca County April 26 25 Moths Caught	391	Cutting Corn Plants 4th Instar
Avon Livingston County May 12 23 Moths Caught	244	Leaf Feeding 1st-3rd Instar
Rush Monroe County May 15 39 Moths Caught	274	Leaf Feeding 1st-3rd Instar
Hounsfield Jefferson County May 16 25 Moths Caught	188	Leaf Feeding 1st-3rd Instar
Casterland Lewis County May 16 23 Moths Caught	146	Leaf Feeding 1st-3rd Instar
Canton St Lawrence May 16 37 Moths Caught	140	Leaf Feeding 1st-3rd Instar
Seneca Falls Seneca County May 22 23 Moths Caught	167	Leaf Feeding 1st-3rd Instar
Munnsville Madison County May 29 27 Months Caught	0	Laying Eggs
Housnfield Jefferson County May 22 25 Moths Caught	96	Leaf Feeding 1st-3rd Instar
Martinsburg Lewis County May 22 23 Moths Caught	96	Leaf Feeding 1st-3rd Instar
Farmington Ontario County May 29 23 Moths Caught	0	Laying Eggs
Martinsburg Lewis County May 29 19 Moths Caught	0	Laying Eggs
Oxford Chenango County May 29 15  Moths Caught	0	Laying Eggs

*Intense Catch is over 15 moths in a week.

True Armyworm Degree Day Accumulations by Location

*Location for Intense Catches	True Armyworm (Base 50)	Life Stage
Seneca Falls Seneca County May 1 29 Moths Caught	291	Leaf Feeding

*Intense Catch is over 15 moths in a week.

 

Potato Leafhopper in Alfalfa

Potato Leafhopper (PLH) has been found in the state. PLH does not overwinter in NYS and travels on storms from the south about this time of the season.  Because of recent storms, we most likely have received more of them. It is best to get out and start scouting for PLH in alfalfa.

For more information, please view the following webpage:

https://cals.cornell.edu/field-crops/forages/insects-forage-crops/potato-leafhopper