-$- 



In early September, 19^2, the T<vriter collected a number of red-banded leaf roller 

 larvae in an orchard in South Amherst and sent them to Professor Schoene for 

 examination. Unfortunately the shipment was delayed enroute and laid over a weekend 

 in a post office so that they did not arrive in Virginia in the best of condition. 

 However, Professor Schoene reported that of ll+ larvae examined, 12 of them vrere 

 diseased. 



No one is ready yet to tell you to stop spraying for red-banded leafroller 

 and let the disease take care of them, but at least we know that the virus is 

 present here in Massachusetts and that we do have this natural aid in the fight 

 against this pest. 



Perhaps the day will come vfhen you are advised to spray your trees with 

 Virus XYZ at 1 qt, per 100 instead of DDD, 



— Ellsworth H. ^Vheeler 

 Extension Entomologist 



HOmiONES FOR PRE-HARVEST DROP CONTROL (1952 results ) 



As you know, we have two major materials for pre-harvest drop control, 

 Naphthaleneacetic acid (NAA) the old standby and 2,li.5-trichloroph5noxjTJropionic 

 acid (2,[i,5-TP - as found in Color Set, Color Lok, etc.). MAA materials' at single 

 and double strength are capable of controlling Mcintosh crop about 7 to 10 days. 

 2,i;,5-TP may control drop for 3 weeks. However, if apples sprayed ivith 2,U,5-TP are 

 allowed to hang over 2 vreeks after spraying they may show distinct signs of hastened 

 ripening v/hich may or may not be desirable, depending on the gro^rers ' objectives. 

 '"/e vfould like to find a material which would delay drop as vrell as 2,lj.,5-TP but not 

 hasten ripening as much as it does. 



Last year \vorkers in New York State obtained data which indicated that 

 2,[t,5-TA (2,li,5-trichlorophenoxyacetic acid) might be such a material. Consequently, 

 we were interested in comparing it with 2,ii,5-TP, In Table 1 are the final results 

 of such a comparison. 



Table 1. A comparison of 2,ii,5-TF and 2,Ii,5-TA 

 for controlling pre-harvest drop of 

 Mcintosh (1952) 



From our data (not all of which is shown in Table 1) the following statements 

 seem to be justified. 



1, Sixteen days after application 2,h,5-TP was superior to 2,U,5-TA for 

 pre-harvest drop control when both materials were applied as natural 

 drop coipmences (9/8 in this test). 



