Now showing items 1-12 of 12

    • Amelanchier Ailments 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2016-04-15)
      Amelanchiers are in the rose family (Rosaceae) and therefore subject to many of the common insect and disease problems of other ornamentals in that family (ex. crabapple, hawthorn, mountain-ash, etc.) including Entomosporium ...
    • Asian Gypsy Moth Revisited 

      Dailey O'Brien, Dawn; Hudler, George (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2012-07-20)
      Asian gypsy moths are closely related to the “normal” European gypsy moth but with a broader host range and much more mobile females. The two “strains” look so much alike that the only way to conclusively distinguish them ...
    • Common Euonymus Pest Problems 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2014-06-27)
      In some areas, the overuse of Euonymus species has resulted in mono-cultures of plants highly susceptible to attack by opportunistic insects or diseases. Some of the most common euonymus pests seen when scouting include ...
    • Doggone Insect Pests of Dogwood! 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2015-06-26)
      Three key insect pests of the tree and shrub forms of dogwoods (Cornus sp.) include dogwood borer, the dogwood sawfly and cottony maple leaf scale. Signs, symptoms, life history and management of each are covered.
    • Gypsy Moth? Still Making Headlines 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2016-05-13)
      The purpose of this article was to alert readers to predictions of high gypsy moth populations in parts of the Northeast in 2016 and to watch for Asian gypsy moths. Two natural controls of gypsy moths - the gypsy moth ...
    • Hawthorn Diseases and Insects 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2017-06-16)
      Hawthorns are deciduous trees in the apple family that are often used in the landscape because of their attractive clusters of white or pink spring flowers, dark green leaves, appealing shape and size (usually between 15 ...
    • Horsechestnut Leaf Problems 

      Dailey O'Brien, Dawn; Hudler, George (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2013-05-31)
      Horsechesnut (Aesculus spp.) are threatened by pests and pathogens that are likely to cause premature leaf dieback and abscission including horsechestnut leafminer, horsechestnut leaf blotch, horsechestnut leaf scorch an ...
    • Oyster-Shaped Scales 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2017-04-21)
      Some of the more common oyster-shaped scales insects seen in the New York region include Oystershell Scale (Lepidosaphes ulmi), Euonymus Scale (Unaspis euonymi) Winged Euonymus Scale (Lepidosaphes yanangicola), Japanese ...
    • Problematic Privets 

      Dailey O'Brien, Dawn; Hudler, George (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2012-06-15)
      Privet (Ligustrum spp.) is widely used as a landscape hedge and for the most part seems to tolerate life in a wide range of sites. However, there are number of pests that are commonly seen on this host. They include privet ...
    • The Gall of Those Midges! 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2013-05-17)
      Midges are small fly-like insects in the Cecidomyiidae family of flies (order Diptera) that are likely to be noticed only by the most astute of observers. A gall is the result of a reaction by a plant to irritation. There ...
    • Viburnum Pests 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2016-04-29)
      Common insect pests of viburnums include the black bean aphid (Aphis fabae) and the snowball aphid (Neoceruraphis viburnicola), Viburnum Leaf Beetle (Pyrrhalta viburni), the viburnum clearwing borer (Synanthedon viburni) ...
    • What is Making My Spruce Tree Drop its Needles? 

      Dailey O'Brien, Dawn (Cornell University Department of Plant Pathology and Plant-Microbe Biology, 2013-08-09)
      Spruce trees are susceptible to a variety of needle diseases that cause their needles to shed which can severely affect their aesthetic value and the health of the tree. Spruces can become more susceptible to diseases and ...