Right now they are in the larval stage of their second generation. 0000003919 00000 n 9.2 x 13.7 in trailer Please contact your Account Manager if you have any query. Science Photo Library's website uses cookies. They are yellow-green with black blotches on their sides and a black head. 0000001379 00000 n Dusky birch sawfly (Croesus latitarsus) Pest description and damage Mature birch sawfly larvae are yellowish with rows of black spots along the abdomen and 0.75 inch long. US toll free: 1-844 677 4151, © Science Photo Library Limited 2020 0000001792 00000 n Dusky birch sawfly; European pine sawfly; White pine sawfly; Larch sawfly; Yellow-headed sawfly; Redheaded pine sawfly; Mountain ash sawfly; Willow sawfly; Pear sawfly (AKA pear slug) Scarlet oak sawfly; Adults will emerge during the spring and summer after the winter and will feed less on leaf material and more on pollen, nectar, and other bugs. Thank you. Finally, because sawflies often feed in groups, chemical applications should be directed only to the areas they are feeding on; entire tree sprays are unnecessary unless populations are wide-spread throughout the plant. It is found throughout the United States and has two generations per year in NC. The adult is easily recognised by the pale band on its shiny black abdomen. Dusky birch sawfly Croesus latitarsus Order Hymenoptera, Family Tenthredinidae; common sawflies Native pest Host plants: Birch ( Betula) species Description: Adults are wasp-like insects approximately 12 mm long. Heavy defoliation by this insect is rare. Hosts. 0000015247 00000 n If larvae are nearly full grown, control measures should not be attempted as chemicals will not be as effective, and most of the damage that the plant will sustain has already been done. 0000001633 00000 n Continue. Life history and habits. Damage. Ask an Expert is made up of groups and individual experts. endstream endobj 5 0 obj endobj GB 340 7410 88. This is especially true when using biorational products such as insecticidal soap. Up to 25mm long, the largest British Sawfly. This group of sawfly larvae usually feeds only on the leaf surface, leaving a skeleton of leaf veins where they feed. The best control for sawflies or any other pests is preventive measures related to plant health. 0000001565 00000 n Property release not required. Be sure the insecticide you plan to use is labeled for the plant you are treating or if the product is generally labeled for trees and shrubs, that the label does not exclude the plant. Information on the label should be used as the final authority. 0000005250 00000 n Young larvae are much more susceptible to chemical applications than larger, more mature larvae. Correct plant selection, proper site selection when planting, and then continued recommended cultural care will ensure that plants are in excellent health. xref NIGEL CATTLIN / SCIENCE PHOTO LIBRARY. 0000015989 00000 n Dusky birch sawfly, Craesus latitarsus, larvae in defensive position on the leaves on a young silver birch tree, Betula pendula, in Berkshire, England, in September. 0000000696 00000 n 23 0 obj<>stream These products should be considered only after all other management tactics have been explored. Some features of this website require JavaScript. 0000000989 00000 n They spin cocoons when fully grown. Larvae are approximately 24 mm long when fully grown. VAT no. Appearance. Adults have 3-segmented antennae and lay eggs in rows in the edges of leaves. Birch. By sharing this link, I acknowledge that I have read and understand The head is reddish yellow with black eyespots. Biorational insecticides: Insecticidal soap-best for low populations of young larvae. Mechanical control: Examples here include methods such as hand picking larvae from plants, physically dislodging them by using forceful water sprays, or other means of nonchemical control. the Terms and Conditions. 0000016856 00000 n A second, overlapping generation may occur and feed through September. Adults have 3-segmented antennae and lay eggs in rows in the edges of leaves. Species; Additional images; Click here to support NatureSpot by making a donation - small or large - your gift is very much appreciated. Science Photo Library (SPL) Sawfly Life Cycle Adult sawflies lay eggs in or on leaves. Overwinter as prepupae in the soil. 0000017081 00000 n startxref Dusky birch sawfly, Croesus latitarsus. The larvae hatch out in late spring or early summer and begin feeding. f��|.�p\_F��7c����m����� ������� S���[��[�Y���Uu�T�U"`�y$'�KO=g�y�߳H� 23.4 x 34.8 cm ⏐ The dusky birch sawfly is an occasional pest of birch trees, particularly river birch.