214 FUMIGATION METHODS 
‘‘ From this summary it will be noticed that the gas 
at 0.18 and 0.25 gramme had little or no effect upon 
the scale when the fumigating was done in the 
winter ; but that 0.30 gramme was strong enough to 
kill the scales. Also that the spring treatment resulted 
in killing the scales with the gas at 0.18 gramme and 
only one-half hour exposure. All of the plum trees 
treated were European varieties, and both plums and 
peaches were healthy, vigorous trees. We used the 
box fumigator shown at Figs. 43 and 81 in all caSes. 
Fig. 81 shows our improved method of fastening the 
-door on our fumigator. 
‘* All of the trees were badly infested with the 
scale. Where the term ‘scales dead’ is used it 
means that after very careful search at various times 
during the summer following the experiment no live 
scales could be found. The statement that the trees 
were uninjured means that there was no effect on the 
foliage and fruit buds. 
‘* The buds included in the fumigation experiment 
were of the following varieties: Apples—Jonathan, 
Fall Pippin, Oldenburg, Ben Davis, Fameuse, and 
Transcendant. Cherries—May Duke, Windsor, and 
Early Richmond. Pears—Anjou, Bartlett, Seckel, and 
Kieffer. Peaches—Elberta, Karly Crawford, Blenheim, 
Early Rivers, Beersmock, and Alexander. Plums— 
Italian Prune, Reine Claude, Bradshaw, Shropshire 
Damson, Burbank, Yellow Spanish, Yellow Egg, Lom- 
bard, and De Soto. 
‘The buds were fumigated in a small box made 
especially for the purpose. The gas was used at the 
following strengths: 0.18, 0.22, and 0.30 gramme. 
