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Redheaded pine sawfly - Neodiprion lecontei

Description

Larvae are up to 30 mm long with reddish brown heads and yellow bodies with 6 rows of irregular black spots. Adults are brownish and wasp like.

Damage

Larvae feed in groups on 2 and needle pines and can completely defoliate a tree. Heavy infestations may kill small or weakened pines.

Cultural Controls

Prune out and destroy heavily infested branches.

Remarks

Treat foliage at the first sign of activity in mid-June. Apply chlothianidin or imidacloprid as a soil injection or drench in the fall. Spring applications should be made foliarly.

Chemical Controls

Acephate

Signal Word: Caution
Pesticide Class: Organophosphate

Azadirachtin

Signal Word: Caution
Pesticide Class:

Bifenthrin

Signal Word: Caution
Pesticide Class: Synthetic pyrethroid

Carbaryl

Signal Word: Caution
Pesticide Class: Carbamate

Chlorpyrifos

Signal Word: Danger
Pesticide Class: Organophosphate

Clothianidin

Signal Word: Caution
Pesticide Class: Neonicotinoid

Cyfluthrin

Signal Word: Caution
Pesticide Class: Synthetic pyrethroid

Deltamethrin

Signal Word: Caution
Pesticide Class: Synthetic pyrethroid

Diflubenzuron

Signal Word: Caution
Pesticide Class: Insect growth regulator

Esfenvalerate

Signal Word: Warning
Pesticide Class: Synthetic pyrethroid

Imidacloprid

Signal Word: Caution
Pesticide Class: Neonicotinoid

Imidacloprid+Bifenthrin

Signal Word: Caution
Pesticide Class: Neonicotinoid, Synthetic pyrethroid

Imidacloprid+Clothianidin

Signal Word: Caution
Pesticide Class: Neonicotinoid

Lambda-Cyhalothrin

Signal Word: Caution
Pesticide Class: Synthetic pyrethroid

Malathion

Signal Word: Warning
Pesticide Class: Organophosphate

Spinosad

Signal Word: Caution
Pesticide Class: Microbial

Locations Affected

needles

Plant Environment

outdoors

Scouting Season:

June - Mid , June - Late , July - Early , July - Mid , July - Late , August - Mid , August - Late , September - Early , September - Mid , September - Late

Plants Affected

• Pinus - Pine

Photos

Redheaded pine sawfly larvae feeding on pine needles

Adult redheaded pine sawfly laying eggs in pine needles

Redheaded pine sawfly larvae feeding on pine needles

Characteristic "straw" damage resulting from redheaded pine sawfly larval feeding