200 



Bulletin 307 



following insects were reported in a few orchards : army worm, canker- 

 worm, fall web worm, bud moth, leaf miner, borer, and tree hopper. 



Among the sucking insects, after the blister mite, the oyster shell scale 

 is reported most frequenth', occurring in 202 orchards. Scurfy scale, San 

 Jose scale and aphis also occur to some extent. 



The chief fungus troubles are canker, occurring in 245 orchards, twig 

 blight in 137, scab in S2, and collar rot in 88. 



It is probable that the number of orchards in which the above pests 

 are fo-jnd gives only a ver>^ rough estimate, for no doubt many may have 

 occurred ia orchards for which they were not reported. 



TABLE 29. Orchard Pests 



Name 



No. of 

 orchards 



Chewing insects: 



Codling moth . . . 

 Tussock moth . . . 

 Case bearers .... 



Bucculatrix 



Tent caterpillar. 

 CurcuHo 



Sucking insects: 



Blister mite. . . . . 

 Oyster'shell scale 



Scurfy scale 



San Jose scale. . . 

 Aphis 



Plant diseases: 



Canker 



Twig blight 



Scab 



Collar rot 



133 

 129 



"7 



32 

 16 

 12 



305 

 202 



30 

 24 

 29 



245 



137 



82 



88 



SPRAYING 



General practice 



From the abundance of orchard troubles, it is clearly e\'ident that to 

 produce the best fruit a much more thorough and intelligent spraying 

 campaign must be carried out. Thirty-four per cent of the orchards 

 are unsprayed (Table 30). V.Tien we consider that orchards sprayed 

 once are little better than those sprayed not at all, over half the orchards 

 are practically unsprayed. 



