TiiK Control of Insi-xt Pksts and Plant Disi:asi:s. 617 



ninutes at 54° C. (129.2° F.). Above 54° C. (129.2° F.) there is no safe margin. 

 If the temperature falls slightly below 52° C. (125.6° F.), the time of treatment 

 should be increased in proportion. A temperature lower than 51° C. (123.8° F.) 

 will not be effective. In treating wheat, if the temperature should rise above 

 54° C. (129.2° F.) or fall below 52° C. (125.6° F.) the time for immersion must 

 be diminished or increased accordingly. Under no circumstances should a tem- 

 perature of more than 55° C. (131° F.) be allowed. Temperatures below 51° C. 

 (123.8° F.) are inelTective. 



"Seed treated as indicated maybe planted as soon as it is sufficiently dry to run 

 freely through the drills. In many cases the grain germinates as well or better 

 when rested after treatment than if sown immediately. A good thennometer 

 should be used for all treatments. Several weeks before sowing the seed should 

 be treated for germination." (The above is quoted from Bureau Plant Industry 

 Bulletin 152, pages 39-41.) 



V. GENERAL PLAN FOR SPRAYING THE APPLE ORCHARD. 



I. Dormant season before leaf buds open but just as they are swelling: 



a. Lime-sulfur as a contact spray for 



San Josd scale 32 to 2,2,° Beaum6 1-8. 

 Blister mite 32 to 33° Beaum^ i-n. 



b. Add arsenate of lead, 2 pounds to 50 gallons, to the lime-sulfur as a poison 

 for 



Bud-moth 

 Cigar case-bearer 



II. After leaf buds open but before blossoms open, i. e., when just beginning 

 to show some pink. Watch weather and get spray on before rain, not after: 



a. Lime-sulfur solution, 32° Beaum^ 1-40, or Bordeaux, 3-4-50, for apple 

 scab (the fungus). 



b. Arsenate of lead, 2-3 pounds to 50 gallons, added to lime-sulfur or Bor- 

 deaux as a poison for 



Bud-moth 

 Cigar case-bearer 

 Canker-worm 

 This application should never be omitted during cold, rainy seasons. 



III. After petals have fallen, beginning when about two-thirds have fallen. 

 Have spray oh before rains come. This is important. 



a. Lime-sulfur, 32° Beaum^ 1-40, or Bordeaux, 3-4-50, for 



Apple scab 

 Leaf spot 



b. Arsenate of lead, 2-3 lbs. to 50 gallons, used with lime-sulfur or Bordeaux 

 for 



Codling-moth 

 Canker-worm 

 Bud-moth 

 This is the most important of all the applicaiiotts. 



