EXERCISES 317 



tree borer, San Jose scale, plum curculio, aphis, and tent 

 caterpillar are the most common insects, while peach 

 yellows, u little peach/' brown rot, leaf curl, black knot, 

 peach scab, and shot-hole fungus are the most important 

 diseases of these fruits. 



In controlling these insects and diseases, the trees should 

 be sprayed as directed in a previous chapter. Early in the 

 spring the trees should be carefully inspected and all 

 black knots should be cut out several inches below the 

 knots. 



EXERCISES 



1 . To what class of fruits does the peach belong ? 



2. Can peaches be profitably grown in your section ? Why? 



3. How long does it take a peach tree to come into bearing 

 after planting? 



4. If peaches are grown in your section, name some of the 

 best varieties. 



5. Obtain two or three quarts of peach pits and arrange 

 in a box in alternate layers of pits and clean sand so as to show 

 how they are stratified in actual practice. Remove the pits 

 'and save them for further work. 



6. Get twigs of two different varieties of plums, preferably 

 two varieties growing in your neighborhood. Take from the 

 twigs one flower bud and one leaf bud. Pick them to pieces. 

 By close examination determine how to distinguish a flower bud 

 from a leaf bud. 



7. Obtain, if possible, specimens of the plum curculio. 

 Note the six humps on the back, four real humps and two semi- 

 humps. Note also the snout of this beetle. 



8. Examine plums or apples for puncture of the plum cur- 

 culio. Note the dot and the crescent around it. 



9. If there are cherry orchards in your home locality, de- 

 scribe the methods of orchard management. 



