Apijle Kosette Caused 'o'j Boron .feiiciency 



The accompanying sketch was made from a 

 Mclntosii apple t'.vig from an orchard in Peru, 

 Nevv York, which snows severe boron dericien- 

 cy. iir. A. B. Burrell mailed us some speci- 

 mens early in June to illustrate a symptom 

 known as "rosette", which thus i'ar hus not 

 been observed in Massachusetts. Growers are 

 askea to be on tne lookout for this symptom 

 although there is little likelihood that it 

 will appear this season ovv'ing to the abnorm- 

 ally heavy rainfall. Cornell Bulletin 4L8, 

 "The Boron-Deficiency Disease of Apple," des 

 cribes rosette as follow's: "The tufts may be 

 either at the tips of tvdgs otherwise bare 

 or on spurs. The inaividual leaves are 

 awarfea, stiff, tiiick, brittle, and have 

 smooth margins instead of tne usual notched 

 margins. Leaves v\rith these characteristics 

 sometimes develop without noticeable short- 



ening of interncdes. Kosette may develop 

 any tiiac auring the season. At first, the 

 leaf color is normal; but, late in the sea- 

 son, the rosette twigs may develop incip- 

 ient aieback or lieback. On a given s.hoot, 

 one sometimes sees a gradual transition from 

 normal leaves normally spaced to narrov/ 

 dwarfed leaves and short internodes." 



More Evlaenco on the Effects of Lime Sulfur 



The recorarrienaations which havt been 

 made "Ohis season suggesting the likelihood 

 of severe injury from the use of lime sul- 

 fur has been supported 'oy tests in one of 

 the eollege orcharas. Part of tnis orchard 

 was sprayed 'with lime sulfur in the pro- 

 blossom sprays ana part with a milu sulfur. 

 That part which was sprayed with lime sulfur 

 shows serious injury in the form of dwarfed, 

 crinkled, and scorchea leaves while the part 

 sprayed W'ith milu sulfur shows practically 

 no injury. The severity of the injury on 

 the llm.e sulfur plot was aue chiefly to the 

 unusually tenaor condition of the foliage 

 inauceQ, by heavy rains auring the grov/ing 

 season. Furthermore, it is interesting to 

 note thai: 9«Hb :iua oeen satisfactorily eon- 

 troiiea on the mi la suiiur plots by paying 

 suecl^i c-ttention to timing and coverage. 

 Thus, eviaence continues to accumulate in- 

 dicating that scab can be successfully con- 

 trolled and that lime sulfur injurj'' can be 

 avoided by suostituting milaer forms of sul- 

 fur. 



0. C. Roberts 



