Plant problem library

Pest

European Wheat Stem Sawfly

Cephus pygmaeus (Linnaeus)

The European wheat stem sawfly, Cephus pygmaeus, is an introduced stem-boring pest of wheat and other grasses in parts of eastern North America. Larvae…

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Disease

Stolbur Phytoplasma Disease

‘Candidatus Phytoplasma solani’

Stolbur phytoplasma disease is caused by the wall-less, phloem-limited bacterium ‘Candidatus Phytoplasma solani’. It is associated with stolbur in potato, tomato and other crops,…

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Disease

Pear Decline

‘Candidatus Phytoplasma pyri’

Pear decline is a phloem-limited disease caused by ‘Candidatus Phytoplasma pyri’. In the United States, it is mainly spread by pear psylla (Cacopsylla pyricola)…

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Disease

European Stone Fruit Yellows

‘Candidatus Phytoplasma prunorum’ Seemüller and Schneider

European stone fruit yellows is a serious, vector-borne phytoplasma disease of Prunus trees caused by ‘Candidatus Phytoplasma prunorum’. It is especially damaging to apricot,…

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Disease

Apple Proliferation Disease

‘Candidatus Phytoplasma mali’

Apple proliferation is a systemic phytoplasma disease caused by ‘Candidatus Phytoplasma mali’, primarily affecting apple trees. It produces witches’ brooms, enlarged stipules, leaf rosettes,…

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Disease

Aster yellows

‘Candidatus Phytoplasma asteris’

Aster yellows is a systemic, leafhopper-transmitted disease caused by ‘Candidatus Phytoplasma asteris’ and related strains. It affects many vegetables, ornamentals, weeds and some woody…

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Pest

Horse Chestnut Leaf Miner

Cameraria ohridella Deschka & Dimić

The horse chestnut leaf miner, Cameraria ohridella, is a small moth whose larvae tunnel between the layers of horse chestnut leaves. The resulting pale…

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Disease

Boxwood blight

Calonectria pseudonaviculata

Boxwood blight is a destructive fungal disease caused by Calonectria pseudonaviculata. It produces dark leaf spots, rapid browning and leaf drop, and distinctive black…

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Pest

Pear sawfly (pear slug)

Caliroa cerasi

Pear sawfly, also called pear slug or cherry slug, is a foliage-feeding sawfly whose slimy larvae skeletonize leaves of pear, cherry, plum and related…

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Pest

Pear psylla

Cacopsylla pyri

Pear psylla, Cacopsylla pyri, is a sap-feeding jumping plant louse associated primarily with European pear, Pyrus communis. Nymphs and adults cluster on tender shoots,…

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Pest

Summer apple psyllid

Cacopsylla picta (Förster)

Cacopsylla picta is a small, sap-feeding psyllid associated mainly with apple trees in Europe. Direct feeding injury is usually minor, but the insect is…

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Disease

Pine Wilt Disease (Pinewood Nematode)

Bursaphelenchus xylophilus

Pine wilt disease is a rapidly progressive disease of susceptible pine trees caused by the pinewood nematode, Bursaphelenchus xylophilus. Pine sawyer beetles in the…

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