- 4 



ard. Also, extreme care must be exercised when using the gas cart- 

 ridge during extremely dry weather. Information is available on 

 the trapping of woodchucks by writing this office. 



*************** 



POMOLOGICAL PARAGRAPHS 



Leaf Analysis Servic 



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e^: The leaf analysis service being developed 

 Supply Companies should prove very valuable 

 nd its interpretation is available to the grow- 

 est of Mcintosh. With the analysis in hand, 

 ne the trees and fruits and make sounder deci- 

 tilization the following spring. Furthermore, 

 an alert the grower to possible problems for 

 and storage season. For example, the possibil- 

 p because of low leaf magnesium and the lack 

 r keepability of fruit due to high nitrogen 



from the analyses. Better judgments can be 

 type of storage (CA or regular) and length of 

 rom various blocks with this information. 



Alar Sprays for Delicious : An Alar spray applied in early or mid- 

 August may be beneficial on Delicious that are normally picked 

 late, without significantly reducing fruit size. Our studies have 

 shown that Alar will reduce fruit flesh softening prior to harvest, 

 will delay watercore development and will reduce internal break- 

 down following harvest, but will have no effect on storage scald. 

 Research from other areas indicates that Alar is more effective 

 than 2,4,5-TP for pre-harvest drop control of Delicious. 



Where watercore is normally not a problem, or it is antici- 

 pated that the fruit can be harvested before the disorder becomes 

 too severe. Alar is of questionable value on Delicious. It is too 

 expensive to be used just to prevent pre-harvest drop. However, 

 where watercore has been a problem, or is anticipated to be a prob- 

 lem. Alar can be very helpful. It should be applied at the rate 

 of 1000 ppm (4 lbs Alar - 85 per acre of mature trees) in mid- 

 August, keeping in mind the 45-day pre-harvest interval for this 

 chemical. Alar will not prevent watercore, but will delay its ap- 

 pearance. But even though Alar is applied, the wide variation in 

 the incidence of watercore among Delicious trees makes essential 

 the examination of fruits from several trees in each block if apples 

 are to be harvested before this disorder becomes too severe. 



Rapid Absorption ofParaquat by Weeds : Currently, we are conduct- 

 ing long-term experiments in Massachusetts to determine what ef- 



