-2- 



inexperienced gr'Jv;er the new chart will obviously be confusing and v;e 

 anticipate all sorts of complaints because it lacks the specific recommendations 

 of previous years. For the axperienced gr'^Vi'er, however, who is able to supple- 

 ment the chart with his awn experiences, the new set-up may be a real im- 

 provement. 



In this issue of Fruit Notes v;e present the Notes having to do with 

 Insecticides , In the next issue, the Notes on Fungicides will be presented. 

 The printed chart should be ready for distribution by mid-wintor. 



Insecticides ( Dormant and Delayed Dormant Sprays ) The choice of 

 insecticide depends on the pests to be controlled, Dinitro compounds are 

 most effective against Bud Moth, Rosy jiphis, and the eggs of other apple plant 

 lice. Oil emulsion or miscible oil is desirable to combat Red Mite and San 

 Jose Scale, If one or more pests of each .group are present, a combination 

 of oil and dinitro is recommended, Dinitro compounds (dormant) as prepared 

 for dorniant spraying must be applied v/hen the trees are strictly dormant to 

 avoid injury to the buds. They should be used according to the manufacturers' 

 recommendations. They are available as (1) a liquid to be diluted in water 

 (Elgatol and Krenite)j (2) a powder to add to water or to an oil emulsion (Dow 

 DN dry wettable), and (3) a combination of DN in oil (Nitrokleenup Dow Spray 

 Donnant), Y/hen a DN-oil combination is prepared in the tank, it is desirable 

 to reduce DN to one-half or two-thirds the amount required when used alone, 



Miscible oil or oil emulsion as prepared and recommended by 

 established manufacturers is generally satisfactory. Paste type oil emulsions 

 are frequently preferred. For control of Red Mite Z% actual oil, and for the 

 San Jose Scale 2% actual oil, in the diluted spray is advised. If an 83^ 

 Oil is used, 3 5/8 gallons in 100 are required for a 3% actual oil dilution, 

 while 2 1/2 gallons result in 2% actual oil. If a 75% Oil is used, the 

 amounts for corresponding dilutions are 4 gallons and 2 3/4 gallons, respective- 

 ly. Oil sprays should not be applied v/hen there is danger of continued 

 freezing weather before the spray dries. 



Insecticides (Summer Sprays) Lead arsenate (standard or acid form) 

 is the most commonly used stomach poison during the growing season. It is 

 compatible with the other insecticides listed and vjith most fungicides. The 

 preferred dosages in 100 gallons are; Pre-blossom sprays - 3 pounds; Calyx, 

 1st and 2nd Cover - 4 pounds j 3rd Cover - 3 pounds; 4th Cover - 2 pounds. 



In the 1st Cover period when young fruit is growing rapidly, spreading 

 and sticking is greatly increased by adding 1 pint of fish oil or rav/ linseed 

 oil as follows; In a separate container v^et the lead arsenate to a thick 

 paste, add the oil slowly, and stir to consistency of paint; dilute with water 

 and pour into tank. In the 2nd Cover, when the first generation of the Codling 

 Moth is most active, DDT can be substituted for lead arsenate effectively. In 

 the 4th Cover, DDT or a combination of DDT (50^) 2 pounds and lead arsenate 

 2 pounds is desirable on varieties later than Mcintosh to protect against 

 late Codling Moth, Leaf Roller and Bud Moth as well as Apple Maggot flies. 



