All fumigants were applied according to the manufacturer's recommendation. 

 Fumigants containing methyl bromide (Brozone, Trizone, and MC-33; see table 1, footnote 

 2) were covered with polyethylene tarpaulins immediately after injection. Vidden-D, 

 M-2441, and M-2467 were injected in the same manner as the methyl bromide-containing 

 fumigants, but were sealed with sprinkler application of water. Most of the Vapam was 

 applied with a gravity-flow dribble applicator, and the soil immediately rototilled, 

 roller-packed, and water-sealed. In the 1963 spring fumigation, the 40-gallon-per-acre 

 rate of Vapam was sealed with polyethylene. All fumigants were applied at soil temper- 

 atures above 55°F. with soil moisture near field capacity. In the 1961 fall and 1963 

 spring trials, each replication contained one unfumi gated control plot. Alternate beds 

 were fumigated in the 1963 fall fumigation so that each fumigated bed had an unfumigated 

 check bed adjacent to it. Soil fumigation after 1963 has been on an operational basis 

 with entire "sections" (the area between overhead sprinkler pipes spaced at 50-foot 

 intervals) fumigated and results compared with unfumigated "sections." Either Trizone 

 or a 2:1 mixture of methyl bromide and chloropicrin have been used in these operational- 

 scale fumigations. 



Table I .--Simnary of oonditions represented in soil fumigation studies aonduoted at the 



Coeur d'Alene (CdA) and Savenao nurseries 













Fumig 



ant^ 







Location 



. Species 

 . sown ^ 



. Fumigation : 

 time : 



Brozone 



: Trizone 



: MC-55 



: Vapam 



: Vidden-D ; M-2441 



: M-2467 











lb. /acre - 







- - -gal. /acre- - 





CdA 



WWP,PP 

 DF,ES 



Fall, 1961 



170 

 540 



140 

 180 











CdA 



GF,DF, 

 PP,ES 



Spring, 1965 



110 



170 

 540 



140 



200 



170 



500 



340 

 80 



50 50 



50 



CdA S 

 Savenac 



WWP,DF, 

 PP,ES 



Fall, 1965 



110 

 170 

 540 



140 

 200 



170 

 500 



40 

 80 



50 SO 



50 



^For the fall 1963 fumigation, all species were sown only in the spring at both 

 nurseries except for western white pine, which was sown both in the spring and the fall 

 at Coeur d'Alene and only in the fall at Savenac. WWP - western white pine; PP - pon- 

 derosa pine; DF = Douglas-fir; GF - grand fir; and ES = Engelmann spruce. 



^Brozone = Methyl bromide (68.6%); Chloropicrin (1.4%); inert (30%) - Dow 

 Chemical Co. 



Methyl bromide (61%); Chloropicrin (50%) ; 5-Bromopropyne (6.8%) - Dow 

 Chemical Co. 



Methyl bromide (66.7%); Chloropicrin (55.5%) - Dow Chemical Co. 

 Sodium X-methyldithidcarbamate - Stauffer Chemical Co. 

 1 , 3-dichloropropene , 1 , 2-dichloropropene ; 2 , 3-dichloropropene ; 5,5- 

 dichloropropene and related chlorinated hydrocarbons (100%) - Dow 

 Chemical Co. 



Vidden-D (80%); Chloropicrin (20%) - Dow Chemical Co. 

 Vidden-D (90%); 5-bromopropyne (10%) - Dow Chemical Co. 



Trizone 



MC-55 

 Vapam 

 Vidden-D 



M-2441 

 M-2467 



'Sealed with polyethylene tarp; all other Vapam treatments water sealed. 



3 



