363 
DESCRIPTION OF PLATES. 
Plate xxxiv. —Leslie prime orchard, 7 years old, grown on a rich, deep, fine 
sedimentary soil; situated about 2 miles northwest of Santa Ana, Cal.; affected 
by rust in 1891 and again in 1892. It was sprayed with modified eau celeste dur¬ 
ing the first half of June, 1892, receiving one treatment during the season. This 
treatment was sufficient to cause the trees to retain their foliage, to the extent 
shown, unt. 1 October 4, when the photograph was taken. Compare with Plate 
xxxv, which shows the untreated half of the same orchard. 
Plate xxxv. —Unsprayed half of the prune orchard represented in Plate xxxiv. 
The trees were defoliated through the action of rust. Photographed October 3. 
Plate xxxvi. —Prune tree 5 years old, treated about the 1st of June, 1892, with 
modified eau celeste. This tree was in an orchard affected by the rust, and should 
be compared with the tree shown in Plate xxx vn. Photographed October 3, 1892. 
Plate xxxvii. —Prune tree 7 years old and wholly defoliated by rust. Had been 
bare some time before the photograph was taken on October 3, 1892. Compare 
with Plates xxxiv and xxxvi. 
PRELIMINARY NOTICE OF A FUNGOUS PARASITE ON ALEYRODES 
CITRI R. & H. 
By H. J. Webber. 
In the course of some investigations on “ sooty mold,” * a fungous 
disease of the orange and other citrous fruits, it was soon learned that 
in order to successfully combat the fungus means must first be found 
to remove the insect pests, which evidently induce the disease. In 
Florida the “sooty mold” is principally nourished by the lioneydew 
excreted by Aleyrodes citri (the so-called “white fly”) and certain 
waxy scale insects and aphids ; however, it becomes serious only as it 
follows Aleyrodes citri. In view of these facts, experiments have been 
conducted for the purpose of determining the most effective means of 
combating Aleyrodes. Attempts have been made to discover insect 
enemies of Aleyrodes citri which would aid in keeping the pest in check, 
but to my knowledge no such parasite lias been discovered. In this 
state of our knowledge, I am fortunately able to announce the discovery 
of a fungus which is parasitic on the larvae and pupae of Aleyrodes citri , 
and which may prove useful in fighting the insect. 
While walking through the orange grove of Mr. J. II. Harp, of Cres¬ 
cent City, Fla., in August, 1893, some leaves infested with the larvae and 
pupae of Aleyrodes citri were collected. Mixed with the insects on the 
same leaves the orange-red pustules of a fungus were found, but noth¬ 
ing was thought of the significance of the discovery at the time. In 
January, 1894,1 visited the orange grove of Mr. W. B. Yarn, at Bartow, 
Fla., and again found the same fungus in considerable abundance. A 
more careful examination of this material led to the conclusion that the 
fungus was probably a parasite on the larvae and pupae of Aleyrodes 
Captiodium citri B. &- Desm. 
