Cereal Leaf Beetle

There have been reports of cereal leaf beetle over threshold in western NY. It is time to get out and scout for and make sure cereal leaf beetle is over threshold. Spraying without knowledge of the level of the infestation levels might mean you did not need an application of insecticide. Always scout and make an educated decision!

For more information on cereal leaf beetle and how to scout for this pest please view the following site: https://cals.cornell.edu/field-crops/small-grains/insects-small-grains

Potato Leafhopper

There are several reports of potato leafhopper in alfalfa across NYS. Note that adults migrate on storms from the south. They lay eggs on alfalfa. When the nymphs hatch is when damage to alfalfa can become an issue. It is time to start scouting for potato leafhopper.

For more information on potato leafhopper in alfalfa view the following site: https://cals.cornell.edu/field-crops/forages/insects-forage-crops/potato-leafhopper

Black cutworm and True armyworm

There was one more intense catch with black cutworm in Livingston County. Please know when your corn reaches the V6 stage of growth black cutworm does not continue to feed on the corn.

There have been a lot of migrations of black cutworms this year. If you still have young corn, it is best to get out and scout for the larvae and damage. True armyworm infestations have been very low this year.

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 of the Field Corn Pheromone Trapping Network

 

 

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	492	Cutting Corn Plants 6th Instar
Avon Livingston County May 12 23 Moths Caught	453	Cutting Corn Plants 6th Instar
Rush Monroe County May 15 39 Moths Caught	383	Cutting Corn Plants 5th Instar
Hounsfield Jefferson County May 16 25 Moths Caught	312	Cutting Corn Plants 4th Instar
Casterland Lewis County May 16 23 Moths Caught	304	Leaf Feeding 1st-3rd Instar
Canton St Lawrence May 16 37 Moths Caught	304	Leaf Feeding 1st-3rd Instar
Seneca Falls Seneca County May 22 23 Moths Caught	302	Leaf Feeding 1st-3rd Instar
Munnsville Madison County May 29 27 Months Caught	302	Leaf Feeding 1st-3rd Instar
Housnfield Jefferson County May 22 25 Moths Caught	261	Leaf Feeding 1st-3rd Instar
Martinsburg Lewis County May 22 23 Moths Caught	251	Leaf Feeding 1st-3rd Instar
Farmington Ontario County May 29 23 Moths Caught	214	Leaf Feeding 1st-3rd Instar
Martinsburg Lewis County May 29 19 Moths Caught	177	Leaf Feeding 1st-3rd Instar
Oxford Chenango County May 29 15  Moths Caught	216	Leaf Feeding 1st-3rd Instar
Munsville Madison County May 31 20 Moths Caught	179	Leaf Feeding 1st-3rd Instar
Sterling Cayuga County June 5 16 Moths	93	Eggs Hatching
Skaneateles Onondaga County June 5 22 Moths Caught	93	Eggs Hatching
Cato Cayuga County June 5 26 Moths	93	Eggs Hatching
West Sparta Livingston County June 12 17 moths	—	Laying Eggs

*Intense Catch is over 15 moths in a week.

 

Black Cutworm Degree Days (Base 50 F) Lifecycle Growth Stages

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

 

 

True Armyworm Degree Day Accumulations

*Location for Intense Catches	True Armyworm (Base 50)	Life Stage
Seneca Falls Seneca County May 1 29 Moths Caught	492	Leaf Feeding

*Intense Catch is over 15 moths in a week.

 

Alfalfa Weevil

Alfalfa weevil larvae are still in many alfalfa fields across the state. There have been reports of fields over threshold. Alfalfa weevil can cause damage in regrowth if populations remained high after the 1^st cutting of alfalfa. Note that alfalfa weevil will be pupating soon and feeding will end. View the degree-day model below and compare it to your area of the state. 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 June 6

Weather Station Location	Alfalfa Weevil	Life Stage
Arkport	567	Larvae Feeding 4th instar
Bergan	652	Cocooning-Feeding stopped
Canton	550	Larvae Feeding 4th instar
Ceres	550	Larvae Feeding 4th instar
Conesus Lake	673	Cocooning-Feeding stopped
Corwin	614	Cocooning-Feeding stopped
Farmington	661	Cocooning-Feeding stopped
Gansevoort	748	Cocooning-Feeding stopped
Geneva	677	Cocooning-Feeding stopped
Highland	803	Cocooning-Feeding stopped
Ithaca	705	Cocooning-Feeding stopped
Kinderhook	721	Cocooning-Feeding stopped
Lafayette	679	Cocooning-Feeding stopped
Laurens	531	Larvae Feeding 3rd instar
Malone	458	Larvae Feeding 3rd instar
Northport	811	Cocooning-Feeding stopped
Peru	532	Larvae Feeding 3rd instar
Red Hook	748	Cocooning-Feeding stopped
Versailles	665	Cocooning-Feeding stopped
Watertown	550	Larvae Feeding 4th 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 degree F base temperature

 

Corn Seeding Blight

There is a report of seeding blight issues in Northern NY. In wet fields, this can be an issue. In this case, the fields will be replanted!