128 



POPULAR FRUIT GROWING. 



blue vitriol, it should be of a good, firm grade. If it is flimsy, 

 much fiber may leave the burlap and ultimately get into the noz- 

 zles and clog them. Wood fiber, becoming loose from the in- 

 side of the spray tank, will also frequently cause clogging of 

 the nozzle. A high pressure will drive much sediment through 

 the nozzles that otherwise would clog them. 



Hose. The hose must be strong and durable in order to 

 avoid delays from breakage and disagreeable leakages. Three- 

 ply three-eighth inch is most commonly used. One extensive 

 fruit grower in the East uses seven-ply thre-e-eighth inch hose. 

 It is not advisable to use a larger hose because it does not 

 stand the pressure so well and is heavier to drag around from 

 tree to tree in spraying. 



Thoroughness of work is es- 

 sential to real success in spray- 

 ing. The man who goes about 

 his trees in a "hit or miss" fash- 

 ion, leaving a branch unsprayed 

 here and the center of the tree 

 unsprayed there, is the one who 

 finds that spraying does not pay. 

 An apple that is not completely 

 covered with a coat of poison is 

 not completely protected from 

 the second brood of the codlin 

 moth larvae. Every inch of twig and branch of a tree sprayed 

 for the San Jose scale, that is not coated with the 

 mixture, has just as many live - scales on it as it 

 had before the spraying outfit came by that tree, and 

 hence remains unmolested as a source of infection on the new 

 growth and of re-infection on the treated portions as soon as 

 the coat of spray becomes ineffective. Many who begin to spray 

 after an orchard is about full grown find that the trees are set 

 too closely together. Enough space should be left between the 

 rows to permit the ready passage of the spraying outfit at all 

 times. It is impossible to do good work in spraying trees where 

 one cannot get around conveniently with the spray pole. More- 

 over, in a closely set orchard, a horse pulling a barrel outfit on 



Fig. 59. Inexpensive com- 

 pressed air sprayer for 

 spraying 1 currants, pota- 

 toes, cabbages, etc. 



