MAINE AGRICULTURAL EXPERIMENT STATION. 191O. 423 



lead arsenate), as soon as the buds open, before blossoming. 

 For apple scab, leaf spot, rot; and for bud moth, canker worm, 

 tent caterpillar and forest caterpillar. 



D. Repeat C as soon as the blossoms have fallen. For 

 scab, leaf spot, rot, canker worm, tent caterpillar and codling 

 moth. 



E. Repeat D after about 10 days or two weeks. Formula 

 I or 4 may be used instead if the insects have been controlled 

 by the earlier sprays. 



F. Bordeaux mixture (Formula i), or Lime-Sulphur (For- 

 mula 3 or Formula 4 dilute to summer strength, p. 432), two 

 weeks after the last treatment if the season is very wet. For 

 scab, leaf spot and rot. 



The tent caterpillar, forest caterpillar and canker worm must 

 be met early, (just as soon as they appear), in order that spray- 

 ing shall be effective. 



Kerosene emulsion (Formula 7) applied in June, when the 

 eggs first hatch, is an effective treatment for oyster shell bark 

 lice. It is also destructive to plant lice when these appear. 



For summer spraying of varieties resistant to spray injury 

 use 3-3-50 bordeaux mixture, Formula i. For more tender 

 varieties self-boiled lime-sulphur. Formula 3 ; home-cooked 

 lime-sulphur. Formula 4, diluted to summer strength, or com- 

 mercial brands of lime-sulphur diluted to summer strength, are 

 suggested. Where scab is very prevalent or spraying has been 

 neglected in the past it is advisable to substitute for the first 

 spraying with lime-sulphur an application of 5-5-50 bordeaux 

 made a little earlier in the season before the leaf buds open. 

 It is claimed by those who have experimented with home-cooked 

 01 commercial lime-sulphur diluted to winter strength and ap- 

 plied just before the leaf buds open that they are also very 

 effective in killing the spores of fungi on the twigs in addition 

 to destroying scale and other insects. 



Culture. 



If the curcidio and the apple maggot are present practice 

 clean cultivation, plowing about three times during the season, 

 beginning in June if the curculio is present or in July if only 

 the maggot is troublesome ; the last plowing to be made after 

 tlie fruit is gathered. , 



