24 N. H. AGR. EXPERIMENT STATION [Bulletin 208 



Insect Record. 



The most notable information recorded in this project is the increased 

 spread of the European Corn Borer, Pyrausta nubilalis. Many specimens 

 of borers in various plants have been sent to the entomology department 

 in the course of the past year. Nearly all of these proved to be the native 

 stalk borer, Papaipema nitela, which continues to be unusually abundant. 

 This native insect is not considered to be a serious menace ; but the imported 

 species, on the other hand, is considered by the department to be the most 

 dangerous insect that has threatened American agriculture in many years. 

 Its further spread into New Hampshire has been fought by quarantines 

 maintained by the Federal Bureau of Entomology and by the State Di- 

 vision of Insect Suppression. But the adult moths are able to fly readily; 

 there are two generations a year; and the number of plants in which the species 

 will breed is exceptionally large, including practically all weeds, garden vege- 

 tables and flowers that have a succulent stem large enough to contain the 

 borer. The insect is rapidly extending its range in New Hampshire and 

 will undoubtedly have to be dealt with in increasing degree. 



The gypsy moth, Porthdria dispar, was exceptionally abundant in certain 

 localities. The browTitail moth, Euproctis chrysorrhea, was found over a 

 larger area than last year and appears to be definitely on the increase. 



Apple Scab. 



Experiments were carried out by Messrs. Butler and Doran in two Mc- 

 intosh orchards in which apple scab had proved extremely injurious the 

 previous year, verdigris and various types of Bordeaux mixture being used. 

 In one orchard 4 applications of the fungicides were given, the pre-pink, pink, 

 calyx and 2-weeks-after-the-calyx sprays; in the other orchard the pre- 

 pink spray was omitted. The best control was obtained in the orchard 

 in which the pre-pink was used. 



Effect of Climate on Productiveness. 



An experiment was started for the purpose of studying the behavior of 

 northern grown potato seed comparatively with potato seed grown in southern 

 New Hampshire from the same strain. 



Spraying Potatoes. 



In the potato spraying work, experiments were conducted on the effect 

 of pi'essure and number of nozzles used on the control of late-blight. The 

 potatoes were sprayed four times with 8-4-50 Bordeaux mixture applied 

 every two weeks, but late blight did not develop in the field and no data 

 was obtained. It was, however, noted that neither the number of nozzles 

 used nor the amount of mixture applied per acre had any "stimulatory" 

 effect on the yield of the plants. 



Bean Anthracnose. 



Experiments were made by Mr. Doran on the control of anthracnose 

 by heating diseased seed for 2 hours at 80°C., by dusting and spraying 

 with Bordeaux mixture, and covering the plants during the rainy weather 



