26 



A MANUAL OF DANGEROUS INSECTS. 



and hence will be found in nursery stock shipments. They are usually propagated 

 from seed. As several species of insects breed in the seed, care must be taken about 

 introducing seed for planting. 



A. AN ASH PEST JLIKELY TO BE IMPORTED. 



Eriophyes fraxini Nalepa. 



(Ash Gall Mite. Eriophyiidae; Acarina.) 



Host: Fraxinus excelsior, F. viridis. 



Injury: Forms galls in flowers, fruit, and leaves. (See text fig. 13.) 

 Description and biology: Four-legged blister mite which causes galls by its feeding. 



Liable to introduction on 

 nursery stock. 



Distribution: Europe, 

 Mexico. 



SoRAUER, p.: Handbuch 

 d e r Pflanzenkrankhei- 

 ten, 3d ed., vol. 3, 1913, 

 pp. 127, 128. 



B, OTHER IMPORTANT 

 ASH INSECTS. 



HEMIPTERA. 



AphidldsB. 



Prociphilus bumelise 

 Schranck, a gall-making 

 louse of Europe, which at- 

 tacks the tender leaves and 

 petioles of ash and on its 

 intermediate host, the fir, 

 breeds at the roots. The 

 form on fir roots has been 

 known as Holzncria posch- 

 ingeri Holzner. 

 Coccidae. 

 Armored— 

 Aspidiotus ( Chrysomphalus) 

 nigropunctatus Cockerell; 

 Mexico. 



Chionaspis salicis Linnaeus, the willow scale; Europe; attacks i^oiimis ficf/s/or and many other trees . 

 Parlatoria affinis Newstead; Algeria; attacks Frazinus oxyphylla and olive. 

 Unarmored— 

 Fonscolombia fraxini Kaltenbach; Europe; attacks Fraxinus excelsior. 



ORTHOPTERA. 

 Ocdipodldae. 



Pachylylus migratorius Limiaeus, the migratory locust; Europe; iajures many plants. 



COLEOPTERA. 

 Caiitbaridae (Meloidse). 



Lytta vesicatoria Linnaeus, the Spanish fly; all Europe; very injurious as adult. 



Ccrambycidae. 



Cerambyx cerdo Linnaeus, the great oak borer; Europe; bores in wood. (See Oak.) 



Scarabseidse. 



Melolontha hippocaslani Fabricius, a May beetle; Europe; injures the roots of seedlings of various 



trees. 

 Melolontha melolontha Linnaeus, a May beetle; Europe; injures the roots of seedlings, and the adults 



attack the foliage. 



EiG. 13. — Ash gall mite {Eriophyes fraxini): Gall formations on twigs 

 of Fraxinus excelsior. (Gillanders.) 



