tnces between the suinnier and spring treatments. Since these results are 

 in agreement with those of previous years it seems to be apparent that mid- 

 summer is the best time of year to treat witchgrass with TCA with the 

 least expenditure of money for materials. 



A. R. HODGDOX 



New Organic Fungicides Give Good Control 

 of Apple Scab and Excellent Fruit Finish 



Sulfur is gradually being replaced for the control of apple scab by 

 new organic fungicides which give better control and cause less injury to 

 the fruit. Phygon has proven to give excellent control of apple scab with- 

 out causing any noticeable injury when used in the early part of the sea- 

 son. Captan has also given good scab control and excellent fruit finish. 

 Probal)ly it will find a definite place in the spray schedule, especially in 

 the cover sprays- Crag Fruit Fungicide 341 has given good control of 

 scab and good fruit finish, but it has caused some injury to certain varie- 

 ties when used in comliination with some insecticides. It should he given 

 further trial before it is adopted in a complete spray program. 



A. E. Rich 



Use of Wood Wastes, Such as Sawdust and Lignin in Compost 

 with Soil and Manure, and Their Effect on Plant Growth 



Uuv work done during 1952 was with two types of wood waste com- 

 posts. The first of these contained mixtures of birch shavings and other 

 organic materials and the second contained mixtures of fresh sawdust 

 and organic materials. Some work was also done with sawdust and sew- 

 age sludge mixtures as a soil amendment. 



\'egetable crops were grown in mixtures of the above materials and 

 soil throughout the year. This work was done in the greenhouse and in 

 outdoor growing bins. 



Hen manure and silage were found to be the most satisfactory sup- 

 plements to wood waste in a composted form. Sewage sludge did not appear 

 to be as satisfactory. ^Mixtures of soil and wood waste composts contain- 

 ing satisfactory organic sources of nitrogen gave higher yields than did 

 good fertile soil to which no organic matter was added. 



S. DuxN 



New and Unusual Diseases in New Hampshire 



Xeedle blight of red pine was observed in several red pine stands in 

 the State. It appears to be associated with insect injury- 



Alternaria blight of muskmelons was serious in 1952. 



Verticillium wilt of potato and Dutch elm disease continued to in- 

 crease in distriljution and severity. 



Black rot of apples was more serious than usual this year. Apple scab, 

 although not new or unusual, was very severe during the 1952 growing 

 season. Potato and tomato late blight, on the other hand, were relatively 

 scarce. 



A. E. Rich 



OTHER ACTIVE PROJECTS 



The Flora of New Hampshire 



A. R. HODGDOX 



15 



