22 MASS. EXPERIMENT STATION BULLETIN 436 



showed considerable Mycosphaerella, Choanephora, and Allernaria rots at harvest. 

 The squash from the sprayed plots showed the least amount of decay in storage 

 September 25, 1945-January 2, 1946). The sprayed plots ranked fifth in yield. 



There was no difference in amount of decay between long and short stemmed 

 squash from unsprayed field plots. 



Dipping Hubbard squash in wax-water-formaldehyde emulsion^ after harvest 

 did not control decay and did not prevent shrinkage from transpiration. The 

 same treatment of Butternut squash reduced shrinkage considerably but had no 

 effect on the control of decay. 



Detail drawings of the fungi of squash decay and photographs of the various 

 kinds of decay have been prepared. 



Interrelation of Wettable Sulfur, Lead Arsenate, and Lime in Apple Spraying. 



(E. F. Guba, Waltham.) Studies were handicapped by the lack of fruit due to 

 freezing and unseasonal temperatures during and subsequent to the blossoming 

 period. 



Several fungicides were compared for their eradicant effect on foliage scab. 

 Fermate IJ^ pounds, Puratized N 5 E 6 1/3 liquid ounces, and lime sulfur 2 

 gallons in 100 gallons of water gave the best results, judged by germination 

 studies of the scab spores sampled from the scab lesions at intervals following 

 the treatments. Of these, Puratized gave a superior eradicant effect. The foli- 

 age was freed of viable scab spores and the scab mold was removed without any 

 leaf injury. There was no spore germination associated with the Fermate treat- 

 ment although the spores appeared normal; yet the character of the scab mold 

 on the leaves seemed not to be changed and the amount of scab appeared to 

 increase. The eradicant action of lime sulfur appeared good, yet there was a 

 considerable come-back in spore germination and some burning of the foliage. 

 A second and third treatment gave more complete disinfection of the foliage. 

 The addition of lead arsenate contributed nothing to the eradicant action of 

 lime sulfur. 



Analytical studies of sprayed foliage showed greater initial deposits of flotation 

 paste sulfur than of dry wettable sulfur. Weathering action caused more loss 

 of dry wettable than of paste sulfur. Paste sulfur gave the better control of 

 scab. 



On the basis of a small tabulation of apples, the period of susceptibility to fruit 

 russet on Baldwin and Delicious apples is believed to occur in the pink, calyx, 

 and first cover stages in tree development. Since none of this injury is caused 

 by a combined spray of Fermate and lead arsenate, it is recommended not to use 

 combined sulfur and lead arsenate until the period designated "second cover." 



Resistance to Fusarium dianthi Prill, et Del., the Cause of a Serious Carna- 

 tion Wilt Disease. (E. F. Guba, Waltham.) From a list of carnation varieties 

 determined to be significantly resistant to Fusarium dianthi, the following were 

 retained for breeding purposes and further study. 



Dorothy Napier King Cardinal 



Eleanor Maine Sunshine 



Elizabeth Rowe Miller's Yellow 



Georgina M)^ Love 



Hazel Draper Puritan 



Helen Hussey Tom Knipe 



John Briry Woburn 



^This wax emulsion disinfectant consisted of 2 quarts formaldehyde, 20 gallons water, and 3 

 gallons Ceremul wax (Socony Vacuum). 



