167 



Childs (L.). Amounts of Spray required on Trees of different Ages 

 in the different Applications. — 3rd Crop Pest & Hortic. Kept.. 

 1915-20, Oreqon Agric. Expt. Sta., Corvallis, 10th January 

 1921, pp. 121-122. 



A lack of understanding of the amount of spray material required 

 for trees of different ages has often been the cause of failure to check 

 the ravages of many familiar insects and diseases. In this paper 

 the necessity of recording and studying the average amount used per 

 tree of every spray applied during the season is emphasized. WTiere 

 this is done, it is found that the use of irregular amounts of spray is 

 the cause of decided irregularity in insect control. In the case 

 of autumn applications of Bordeaux mixture, where twigs, 

 branches and trunks must be thoroughly covered, more time and 

 material is required than for the coating of foliage and fruit in summer 

 sprays. About 2 U.S. gals, more spray is required in the autumn on 

 old, bearing trees than is required on the same trees in the simimer. 

 A table shows the average amount of spray per tree applied in well- 

 sprayed orchards of different ages in Hood River Valley, where very 

 satisfactory results have been obtained. 



Lathrop (F. H.). The Rusty Leaf Mite. — 3rd Crop Pest & Hortic. 

 Rept., 1915-20, Oregon Agric. Expt. Sta., Corvallis, 10th January 

 1921, pp. 123-124,^1 fig. 



Injury to fruit foliage in Oregon is caused by Phyllocoptes schlcctendali 

 (rusty leaf-mite), which is found throughout the prune, pear and apple 

 districts. The mites hibernate in the winter beneath the bud 

 scales, generally of apple, and when these are swelling in the spring 

 they become active on the buds and opening leaves and continue 

 on the foliage throughout the summer, causing curling and russeting 

 of the leaves. Sometimes the fruit also is russeted, and cracks appear 

 on the surface. Sulphur, either as a dust or liquid, should be used 

 in the summer months when the mites are exposed on the foliage. 



Fulton (B. B.). Tree Crickets.— 5rt^ Crop Pest & Hortic. Rept. 

 1915-20, Oregon Agric. Expt. Sta., Corvallis, 10th January 

 1921, pp. 125-126, 1 fig. 



Tree crickets [Oecanthus spp.J are often the cause of splitting or 

 breaking of raspberry and loganberry canes, owing to their oviposition 

 punctures. Raspberry cane blight fungus also frequently enters 

 the canes at the punctures. If numerous enough to cause serious 

 damage, the affected canes should be cut out and burnt in the autumn 

 or spring. 



General Insect Notes. — 3rd Crop Pest & Hortic. Rept., 1915-20, 

 Oregon Agric. Expt. Sta., Corvallis, 10th Januar\' 1921, pp. 

 127-130, i fig. 



Xylehorus dispar (shot-hole borer) has been injurious to fruit trees 

 for the past three seasons, prune and pear trees suffering most. It 

 was found that only unhealthy trees affected with sour sap are attacked. 

 Better cultivation and the maintenance of healthy conditions will 

 save the trees from attack. If infestation is observed, 1 U.S. gal. soft 

 or liquid fish-oil soap, with ^ pint crude carbolic acid to 3 U.S. gals. 



