. The fruit-growers guide-book. istribution. The galls increase in size rapidlyand usually last for only one season, after which theydecay, only to reappear again the next season. Trees arefrequently so badly affected as to either die or be of littlevalue. No means is known of preventing the spread of thedisease or of destroying it after it has once entered a inspection of nursery stock and burning all of theinfested trees is all that can be suggested at the presenttime. Fly Speck, Sooty Blotch. These diseases ordinarilyappear on the fruit from unsprayed trees, in low ground, Rust
. The fruit-growers guide-book. istribution. The galls increase in size rapidlyand usually last for only one season, after which theydecay, only to reappear again the next season. Trees arefrequently so badly affected as to either die or be of littlevalue. No means is known of preventing the spread of thedisease or of destroying it after it has once entered a inspection of nursery stock and burning all of theinfested trees is all that can be suggested at the presenttime. Fly Speck, Sooty Blotch. These diseases ordinarilyappear on the fruit from unsprayed trees, in low ground, Rust 159 and upon ihc lower limbs of trees in dryer locations. Tt ispurely a skin disease and causes no injury aside from dis-figuring the appearance of the fruit. Can be easily con-trolled with bordeaux mixture or any of the ordinaryfungicides. Mildew. The powdery mildew often occurs on theyoung shoots of nursery stock, making a dense felt-like,growth over the leaves and twigs. It can be controlledwith any of the usual Apple blossoms. On the left, just right for the first ap-plication of spray to control scab and codling moth. Clusteron the right is too late for the codling moth. Rust. The bright orange colored patches of rust thatare to be found on the leaves and fruit of apples, pear andquince, as well as upon the wild thorn and crab trees, arecaused by the same fungus which makes the cedar ap-ples on cedar trees. It spends a part of its existence onthe apple trees and the other part on the cedar, so thatthe most effective means of controlling this fungus is to 160 The Fruit-Growers Guide-Book gel rid of the cedar trees. Spraying with bordeaux mix-ture or self-boiled lime-sulphur aids in checking the dis-ease, but does not give perfect control. Root Rot. This trouble is of common occurrence inseveral parts of the country. In the Middle West it oc-curs more frequently on trees which have been planted onland newly cleared from oak timber. In such cases itseems to be c
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