i.IAJOR CimiGES IN THE 1950 SPRAY AMD DUST CHART FOR APPLE IMSECT CCNTRCL 



Dormant ; No change in the face of the chart, but Note 1 has been rewritten 

 to explain more completely the differences between the older types of DN compounds 

 and those containing butyl phenol. The note also de-emphasizes the substitution 

 of the butyl phenol types of DN's for oil sprays against overv;intering eggs of 

 Red Mite. 



Delayed Dormant ; Miscible or emulsible products containing at least 96^ 

 superior type oil or raw superior type oil, tank-mixed, with blood albumin are 

 recommended in applications made Y;hen l/k to l/2" of green leaf tips are showing, 

 A note indicates that superior oils may be used when 1, 2, or even 3 leaves are 

 folded back from the bud. 



Pink: DDT has been given preference over lead arsenate because of the 

 lessened danger to pollinating insects and also because of its increased effective- 

 ness on plant bugs. Nicotine sulfate is recommended only when DDT is not used. 



Calyx ; No change in the face of the chart except additional references to 

 notes on curculio and leafroller, Prtiere plum curculio has been especially 

 destructive, it is recommended that 2 lbs. of ^0% methoxychlor wettable powder be 

 substituted for DDT in the DDT-lead arsenate combination. Methoxychlor at 3 to 

 U lbs, of the ^jO% powder is recommended in Calyx, First and Second Cover sprays 

 on inter-planted peach and apple blocks. The note on leafroller refers to the use 

 of DDD at 1 lb. of ^0% v/ettable powder or 1 qt. of 2^% emulsion in a special 

 application either before or after First Cover if leaf rollers are sufficiently 

 abundant to vfarrant such a spray. 



First Cover ; No change except as indicated in paragraph above. 



Second Cover ; The use of a summer miticide is suggested in the Second Cover 

 wherever 5 or more active stages or eggs are found per leaf. TEPP is recommended 

 as the lowest cost miticide available which can be used at any time during the 

 groviing season. A safety warning is included and also the fact that TEPP is 

 incompatible with Phygon and probably phenyl mercuries at least on some varieties. 



Third Cover ; No change except for the recommendation of TEPP as a miticide 

 as indicated in the above paragraph. 



Fourth and Fifth Covers ; No change except that under Note 8 Parathion is 

 discussed. Following a suitable warning statement, Parathion is suggested to 

 control Summer Brood Bud Moth. This v/ould be in the Fourth Cover or in an early 

 Fifth Cover. Parathion is suggested also for use in the Fifth Cover spray virhen 

 mites are still a problem and it is necessary to combat newly hatched Red-banded 

 Leafroller, The possibility of injury on Kclntosh and related varieties when 

 Parathion is used at concentrations greater than l/2 lb, of \S% pov;der is noted 

 here. You will note that the use of Parathion previous to Fourth Cover is not 

 recommended. 



DDD is recommended in place of DDT wherever i, second-brood Leafroller is 

 a problem. 



— Ellsworth H. lYheeler 



■!(••!(■■><■* ■>!■ -,i ■!<• -if- ■,<■ ir -ir -it •«■ -,i -,'r -A -,•- ■>(■ 



