Black cutworm and True armyworm

There have been a few intense catches for black cutworm and true armyworm with our field corn pheromone-trapping network in western NY. The flight for both black cutworm and true armyworm in Seneca County (Seneca Falls) has hatched. You might see leaf-feeding for black cutworm but most likely no cutting yet. For true armyworms, the typical symptoms are feeding on the edge of the leaf and working their way to the midrib. The black cutworm flight in Monroe County (Rush) is laying eggs.  For management information on both insect pests, please view the following page.

Black Cutworm

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

True Armyworm

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

2022 Interactive Pheromone Trapping Network Map on Black Cutworm and True Armyworm Flights




Black Cutworm Degree Day Accumulations from March 1 to May 16

*Location for Intense Catches	Black Cutworm (Base 50)	Life Stage
Seneca Falls Seneca County April 26 25 Moths Caught	136	Leaf Feeding 1st-3rd Instar
Rush Monroe County May 15 39 Moths Caught	30	Laying Eggs 1st-3rd Instar

*Intense Catch is over 15 moths in a week.

True Armyworm Degree Day Accumulations from March 1 to May 16

*Location for Intense Catches	True Armyworm (Base 50)	Life Stage
Seneca Falls Seneca County April 26 29 Moths Caught	136	Eggs Hatch

*Intense Catch is over 15 moths in a week.

Alfalfa Weevil

Alfalfa weevil activity has increased this week. There are a few reports from the Western New York Crop Management Association that alfalfa weevil are over threshold in some fields. It is time to scout fields and determine if your alfalfa is over threshold.

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 5

Weather Station Location	Alfalfa Weevil	Life Stage
Arkport	224	Egg Laying
Bergan	246	Egg Laying
Ceres	246	Egg Laying
Corwin	219	Egg Laying
Gansevoort	263	Egg Laying
Geneva	268	Egg Laying
Highland	328	Larvae Feeding
Ithaca	293	Hatching
Kinderhook	266	Egg Laying
Laurens	284	Egg Laying
Malone	179	Egg Laying
Northport	321	Larvae Feeding
Peru	175	Egg Laying
Red Hook	287	Egg Laying
Versailles	287	Larvae Feeding
Watertown	196	Egg Laying

 

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 degree F base temperature

 

Cereal Leaf Beetle

There are more reports of cereal leaf beetle adults on small grains. There have been no eggs or larvae reported yet.

https://cals.cornell.edu/field-crops/small-grains/insects-small-grains

Powdery Mildew

There are a few reports that some fields of small grains have powdery mildew. This disease can really limit yield if it reaches high infestation rates. Please view the following page for more information.

https://cals.cornell.edu/field-crops/small-grains/diseases-small-grains/foliar-diseases

Pea Aphids

Pea aphids have been found in alfalfa fields. Pea aphids generally do not cause yield losses due to the fact NYS has many natural enemies that control them. In recent years, we have had some fields that reach an economic threshold for this pest. For more information on pea aphids please view the following page:

https://extension.entm.purdue.edu/fieldcropsipm/insects/pea-aphid.php