Agricultural Research in N. H. 41 



shire Victor tomatoes. The following treatments were made at planting time: 

 (1) 5-10-10 fertilizer in bands at the rate of 600 pounds per acre, (2) a 

 shovel of well-rotted manure, (3) manure plus superphosphate, (4) Ammo- 

 nium nitrate in water and supplied to the plants during the growing season, 

 (5) check. The plants were sprayed with DDT to control insects but no fun- 

 gicides were used. 



Complete defoliation occurred on the plants in all treatments by Sep- 

 tember 13. The number of pounds of marketable fruits per plant from the 

 plots was as follows: New Hampshire Victor check plots 8.7; Manure only 

 12.9; Manure plus superphosphate 11.5; 5-10-10 fertilizer 10.7 and Ammo- 

 nium nitrate in water 9.2. For Marglobe check 3.6 ; manure 4.7; manure 

 plus phosphate 4.7; 5-10-10 fertilizer 7.2, and Ammonium nitrate in water 

 4.6. 



The defoliation of the plants by Alternaria blight was not significantly 

 changed by the fertilizer treatments. The yields, however, were affected as 

 shown. 



M. C. Richards 



Plant Disease Investigations 



Spur blight continues to be a prevalent disease of raspberries in New 

 Hampshire. Spray applications were made this year as follows: April 15 — 

 Elgetol %-100, to all plots except the checks. June 6 and August 15 — Fer- 

 mate 2-100, Phygon 1-100 and Puratized 1 pint-100 followed by Fermate 2- 

 100. The Latham variety showed a slightly higher percentage of infected 

 canes than Viking or Taylor. On September 3, 1946, the average number 

 of diseased canes for the three varieties was as follows: Elgetol-Fermate, 

 33.3 per cent; Elgetol-Phygon, 36.9 per cent; Elgetol-Puratized-Fermate 37.8 

 per cent, and Check 58.3 per cent. 



Whether or not a relationship exists between spur blight and winter in- 

 jury is not known. There were about half as many canes this year as last, 

 though a considerable amount of injury occurred this past winter to all three 

 varieties. 



Tomato plants which were tied to stakes smeared with juice from 

 mosaic-infected plants in September, 1946, developed a few more mosaic 

 plants than those tied to new stakes. Plantings were made in the greenhouse 

 in April, 1947. In handling the plants, care was taken not to spread the mo- 

 saic from plant to plant or from plot to plot. 



M. C. Richards 



Testing New Pesticides 



Certain fungicides which have been used for the control of various dis- 

 eases were tested, this year, in comparison with some of the newer organic 

 and inorganic fungicides. Fungicides used in the spray tests were as follows: 

 Zerlate, (zinc dimethyl dithiocarbamate) ; Fermate, (Ferric dimethyl dithio- 

 carbamate) ; Phygon, (Dichloronaphoquinone) ; Manganese ethylene bis- 

 dithiocarbamate; Parzate, (Zinc ethylene bisdithiocarbamate) ; Puratized, 

 (Phenyl mercuri triethanol ammonium lactate); Tribasic copper sulfate; 

 and Bordeaux mixture, 10-10-100, and 10-5-100. 



