February, ’23] 
SASSCER & WEIGEL: GREENHOUSE FUMIGATION 
87 
were 68° F. for the dry bulb and 66° F. for the wet bulb, with a humidity 
of 89%. 
In this instance 99% mortality of the fern scale was secured as com¬ 
pared with 80% of the hemispherical scale. In addition to Nephrolepis 
bostoniensis, two other varieties of ferns, viz: N. scottii andN. Teddy Jr., 
were represented. The latter suffered severe burning as did the follow¬ 
ing florist’s greens, Asparagus plumosus and A. sprengeri, which were also 
in the greenhouse fumigated. 
Experiment iii. Control of the camphor scale, Pseudaonidia duplex 
(Ckll.) 
The fumigation tests conducted at New Orleans during August and 
September 1921, and again in January and February 1922, indicated 
that 1 ounce sodium cyanid per 1,000 cubic feet of space was effective 
against this coccid when the temperatures ranged from 45° F. to 70° F., 
whereas ounce per 1,000 cubic feet sufficed at temperatures above 
70° F. These results are based on the examination of 20,470 specimens. 
Miscellaneous Fumigation Results 
At intermittent periods during the year numerous box and greenhouse 
fumigation tests were carried on, and further data were accumulated on 
the control of the insects and host plants listed below. 
The Florida red scale, Clirysomphalus aonidum (Linn.), on palms, 
ficus, citrus, and camphor, was controlled by fumigation at the rate of 
1 ounce sodium cyanid per 1,000 cubic feet of space, at a temperature 
of 78° F. and 87% humidity, with no injury to the plants. Similarly 
with Saissetia nigra (Nietn.), on adiantum ferns, roses, moon-vine, 
peristrophe, citrus and camphor, a mortality of 83% resulted from two 
exposures to the gas at same rate, at a temperature of 67° F.; also 
Clirysomphalus dictyospermi (Morg.); Pseudococcus nipae (Mask.): 
Cerataphis lataniae (Bois.), on Kentia and Areca palms; and Parlatoria 
theae mridis Ckll. on Aucuba japonica, a 98% control was obtained, with 
no injury to the host plants. The fumigated plants showed a decided 
stimulation of growth. 
President J. G. Sanders: This is a line of work that promises great 
development and is an interesting and profitable one. I believe our 
greenhouse men probably have received less thought and attention from 
the entomologists and plant pathologists than any other line of agri¬ 
culturists. 
We will pass to the next paper on the program “Results of Spraying 
and Dusting for the control of the red spider,” by D. M. DeLong. 
