April, ’23] 
ARNOLD: UNIFORM FUMIGATION REQUIREMENTS 
163 
an ounce to each thousand cubic feet for tender crnamentals was suffi¬ 
cient to kill the Japanese Camphor Scale. Judging by the numerous 
carefully conducted experiments made by these investigators, the 
Camphor Scale seems to be killed by as small a dosage as the above. 
It is my opinion that this small dosage would not be effective on Camphor 
Scale except under ideal conditions as regards humidity, temperature, 
tight fumigation house and extreme care on the part of the operator. 
Nor could such a dosage be expected to be of value against such scales 
as San Jose Scale (Aspidiotus perniciosus ), Florida Red Scale (Aspi- 
diotus ficus) and Dictyospermum Scale (Chrysomphalus dictyospermi). 
In fact, on several occasions inspectors of the Mississippi Plant Board 
have found specimens of some of the above scales in shipments of nursery 
stock from New Orleans accompanied by the special Louisiana certificate 
of inspection showing the plants to have been fumigated under super¬ 
vision, and, when examined in the laboratory, the scales had the ap¬ 
pearance of being alive. 
Several of the nurserymen present at the Atlanta conference ex¬ 
pressed the opinion that they could better comply with the fumigation 
requirements of the states in the South into which they ship nursery 
stock if the fumigation dosage prescribed was the same in all Southern 
States. The chairman of the meeting appointed a committee (on 
which I was included) to investigate this matter and then to recommend 
a standard fumigation dosage to officials in charge of the plant inspection 
work in the several Southern States. 
In order to learn of the ideas on fumigation held by the plant in¬ 
spection officials of the country, a questionnaire was mailed to the 
official in charge in each state. Replies to the questionnaire were re¬ 
ceived from practically all of the forty-eight states. The information 
when tabulated was of considerable interest, because it showed that 
there was much difference of opinion about the fumigation of nursery 
stock. 
Replies indicated that several states in the East and Middle West 
had practically dispensed with fumigation for nursery stock for the 
reason that the San Jose Scale had become very scarce in their states. 
A number of other states recommend fumigation to the nurserymen, 
but do not make it compulsory except when scale is found in the stock 
of a nursery. A number of the states specify that all host plants of 
San Jose Scale should be fumigated as a precautionary measure. Pecan 
stock is required to be fumigated in a few of the Southern States. 
The replies to the questionnaire showed that the dosage used in the 
