ANNUAL REPORT, 1944-45 41 



Percent Control 

 At Springfield (Scolytus nndtistrialus outnumbered Hylurgopinus rufipes brood 

 galleries by approximately 5 to 4 and 5 to 1 in the various piles) 



Orthodichlorobenzene and No. 2 fuel oil (1-8, 20 gals.) 88.5 



Orthodichlorobenzene, D. I. Lestoil, and water (2.5-1-20, 20 gals.) 46.7 



Gesarol SH5 (5'^ DDT in a summer spray oil) and water (1-100, 20 gals.). . . . 9.3 



At Great Harrington (H. rufipes outnumbered S. nudtistriatus brood galleries 

 by between 10 to 1 and 3 to 1 in the various piles) 



Gesarol SH5 and water (1-100, 20 gals.) 8.6 



Orthodichlorobenzene, D. 1. Lestoil, and water (3-75-1.5-30, 20 gals.) 59.6 



Elgetol, D. I. Lestoil, and water (1-0.5-50, 20 gals.) 74.7 



At Amherst (only H. rufipes was present) 



Gesarol SH5 and water (1-100. 15 gals.) 0.0 



Orthodichlorobenzene, D. I. Lestoil, and water (1.9-0.8-15.0, 15 gals.) 73.4 



Orthodichlorobenzene and No. 2 fuel oil (1-8, 15 gals.) 100.0 



Sprays to Prevent Scolytid Infestation of Individual Elm Logs. (\V. B. Becker.) 

 At Amherst, the following spray mixtures applied to the entire surface of indi- 

 vidual elm logs (up to 9 and 17 inches in diameter with bark up to 9/16 and 5^ 

 inch thick) just prior to beetle fllight in the spring gave the indicated percentages 

 of prevention of Hylurgopinus rufipes infestation based on the number of exit 

 holes per square foot of bark in the late fall, as compared with unsprayed logs 

 The figures following each spray mixture indicate the proportion of ingredients 

 and the amount applied per square foot of bark service. 



Percent Prevention 



Creosote and kerosene, strained (1-4, 138 cc; also 1-8, 142 cc.) 100.0 



Orthodichlorobenzene and No. 2 fuel oil (1-12, 170 cc; also 1-8, 113 cc.) 100.0 



Gesarol SH5 (5% DDT in summer spray oil) and kerosene U-200, 141 cc; also 



1-100, 136 cc.) 100.0 



Kerosene alone (164 cc.) 100.0 



Gesarol SH5 and water (1-100, 169 cc.) 784 



Gesarol SH5 and water (1-200, 131 cc) -j^-j 



Dowax, Gesarol SH5, and water (1184-38-3547, 145 cc.) 50.2 



Dowax and water (1-3, 159 cc.) q q 



At Springfield, the following spray mixtures were applied to the entire bark 

 surface of individual logs (up to 7 and 11 inches in diameter with bark up to 

 7/16 and 3/4 inch thick at ridges) when scolytids were beginning to attack them 

 in mid-June. The indicated percentages of prevention of scolytid infestation 

 are based on the number of brood galleries which became established per square foot 

 of bark surface, because of the preliminary nature of the experiment. Scolytus 

 multistriatus was the only or predominant scolytid in the logs. 



Percent Prevention 



Orthodichlorobenzene and No. 2 fuel oil (1-8, 117 cc; also 1-12, 110 cc) gg 3 



No. 2 fuel oil alone (105 cc.) 97 7 



Cuprinol (a commercial preservative used for wood, rope, etc.) alone (98 cc.) 93 



Creosote and kerosene, strained (1-8, 84 cc.) 92 6 



Creosote and kerosene, strained (1-4, 72 cc.) 9q q 



Gesarol SHN20 (20% DDT in an oil) and kerosene (1-100, 94 cc.) 79'8 



Creosote, D. I. Lestoil, and water (946-757-3785, 99 cc.) 75^4 



Kerosene alone (98 cc.) 72 < 



Gesarol .A20 (20% DDT in a dry spray concentrate) and water (18 gm.-3578 cc, 76 cc.) 59 9 



Dowax and water (1-3, 99 cc.) 574 



Creosote, Aresklene (a commercial emulsifier), and water (946-47-3785, 88 cc.) .... 52 7 



Kerosene alone (19 cc.) 5q ^ 



Ammonium sulfamate (a weed killer) and water (454 gm.-3785 cc, 90 cc.) 4g ^ 



Orthodichlorobenzene, D. L Lestoil, and water (473-142-3785, 86 cc ) 19 4 



Gesarol SH5 and water (1-100, 67 cc.) j2 2 



Zinc chloride and water (189 gm.-3785 cc. 128 cc.) c a 



Gesarol SHN20 and kerosene (1-100, 19 cc.) q'q 



