White Pine Sawfly Neodiprion Pinetum Order Hymenoptera, Family Diprionidae; Conifer Sawflies Native Pest

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Pests of Trees and Shrubs White pine sawfly Neodiprion pinetum Order Hymenoptera, Family Diprionidae; conifer sawflies Native pest Host plants: Eastern white pine is preferred, but red pine is also susceptible. Description: Adult sawflies are wasp-like. Mature larvae are approximately 25 mm long. They are pale yellow with black heads and have four rows of black spots from their head to their posterior end. Life history: Females deposit eggs in needles in the spring. Larvae feed from late June to early August. After feeding, larvae drop to the ground and pupate. There are White pine sawfly larva. (260) one to two generations a year. Photo: David Laughlin Overwintering: Pupae in the soil. Damage symptoms: Larvae feed in groups on both new and old needles, generally defoliating one branch before moving to another. They colonize trees of all sizes. They feed on both new and old needles. Consequently, trees can be completely defoliated and killed. Monitoring: Look for signs of defoliated white pine branches from late June to early August. Look for groups of feeding larvae in areas where defoliation occurs. Also look for brown cocoons in the duff under defoliated trees. Physical control: Remove small populations that are accessible, or dislodge with a powerful water spray. Chemical control: Horticultural oil sprays are most effective against young larvae. Use a residual insecticide against older larvae present in large numbers. If larvae are Larvae of dusky birch sawfly (top ) and white pine sawfly nearly full grown, treatment should not be undertaken. (bottom). (261) Chemicals will not be as effective, and most of the Photo: David Laughlin damage that the plants sustain will already have been inflicted. Any sprays that are made should be directed at larval feeding aggregations only, if possible. Biological control: No reports of natural enemies Plant mortality risk: Low Biorational pesticides: azadirachtin, horticultural oil, insecticidal soap, pyrethrins, spinosad Conventional pesticides: acephate, bifenthrin, carbaryl, chlorpyrifos (nursery only), cyfluthrin, deltamethrin, fluvalinate, imidacloprid, lambda-cyhalothrin, malathion, permethrin IPM of Midwest Landscapes 218.

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Home, Yard Garden Pest
UNIVERSITY OF ILLINOIS EXTENSION HOME, Yard Garden Pest College of Agricultural, Consumer and Environmental Sciences, University of Illinois at Urbana-Champaign &Illinois Natural History Survey, Champaign NEWSLETTER No. 14 • August 6, 2008 Cedar–Quince Rust Affects Hawthorn Each spring we discuss cedar–apple and related rusts. In PLANT DISEASES________ the landscape, we are especially concerned with control- Diplodia of Pine Prevalent ling cedar–quince rust on hawthorn (issue no. 3, 2008) Diplodia tip blight is prevalent in much of Illinois this because it causes stem cankers and fruit infection. The summer. Take a look around your town, and you likely cankers cause stem tips to die. The fruit infection is at- will see many pines with brown needles at the tips of tractive only to a plant pathologist. Repeated rain events branches. Entire needles are brown, not just tips of nee- this spring allowed repeated waves of spore movement dles as might occur with scorch, salt injury, or transplant and germination from the alternate host (junipers) to shock. Look more closely at the needles, and you may the susceptible hawthorns. Secondary spread is by myce- see fungal fruiting bodies. They are often most prevalent lia only, and that growth is very limited. In many cases, at the base of needles. If fruiting bodies are not visible, hawthorn fruits have been covered with the aecial fruit- place the needles in a plastic bag with some moist (not ing bodies of this fungus. You can see the aecial spores dripping wet) paper toweling; blow some air into the which have washed or blown onto the foliage.
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ECONOMTC I OF SOME TMPORTANT SAWFLTES ATTACKING CONIFERS TN EASTER!!! NORTH AMERTCA Thesis for the Degree 0? M. S. MECHTGAN STATE COLLEGE Robert Louis Gallun 195.0 This is to certify that the thesis entitled Distribution and Economic Importance of Some Important Sawfliea EastefitfigfiflgAgfiliégra in presen Robert Louis Gallun has been accepted towards fulfillment of the requirements for 1 ML degree in mm /\" = * ~+~——- \\-/ -11/14 %/" ‘f' L/L M". Majg“ professor \ Date M— 0-169 DISTRIBUTION AND ECONOMIC IMPORTANCE OF SOME IMPORTANT SAWFLIFS ATTACKING CONIFERS IN EASTERN NORTH AMERICA By Robert Louis Gallun ;> 'A THEIS Submitted to the School of Graduate Studies of Michigan State College of Agriculture and Applied Science in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Department of Entomology 1950 TH Eats ACKNOWLEDGMENT The writer wishes to express his sincere thanks and gratitude to Professor Ray Hutson whose guidance and help- ful suggestions made possible the completion of this study. Grateful acknowledgment is extended to Messers. Charles B. Eaton and Daniel M. Benjamin of the Forest Insect Labora- tory, Bureau of Entomology and Plant Quarantine, United States Department of Agriculture, who have given much valu- able aid and advice. Both these men have had wide experience in the field and laboratories and their cooperation has been greatly appreciated. The writer is also glad to acknowledge his indebtedness to the following workers in the field of entomology whose prompt replies to letters of inquiry were invaluable in the compilation of data for this paper: J. A. Beal, W. B. Becker, G. M. Bentley, A.
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