wa <yae 
TROPICAL, SUBTROPICAL, AND ORNAMENTAL PLANT INSECTS 
P. A. Berry, in charge of the colonization work on the natural 
enemies of the citrus black fly (Aleurocanthus woglumi Ashby) in Cuba, 
reports that 30 groves, previously heavily infested, are now commerci— 
ally clean as a result of the attack upon the fly by the imported para-— 
site Eretmocerus serius Silv. These groves are distributed throughout 
the island, one being in the province of Camagticy, one in Matanzas, 
two in Santa Clara, one in Pinar del Rio, and the remainder in Havana 
Province. In the latter province the distribution is now so complete 
that on even isolated trees the fly is found to be parasitized. In 
practically all groves in which the parasite has been established for 
some months a very noticeable improvement in coloration is apparent. 
The coating of sooty mold fungus on the foliage and fruit is gradually 
disappearing and the normal coloration and appearance are being restored. 
Those groves which originally had only light infestations have quickly 
become clean. While it is probable that slight outbreaks will show up 
froh time to time in the controlled groves, yet these will be quickly 
cleared up by the parasite before the pest can increase sufficiently to 
be of economic importance. 
H. H. Richardson has found, as a result of investigations at the 
greenhouse in Washington, D. C., that "Insecticidal tests of a standard 
commercial insecticide containing 11.7 per cent potassium soap, 2.1 per 
cent potassium carbonate, 7 per cent terpenes, and 79.2 per cent water 
‘indicated that this material (at a dilution of 1 to 16, 6.5 per "Genw 
was quite promising for the control of both the common red spider mite 
(Tetranychus telarius L.) and the citrus mealybug (Pseudococcus citri 
Risso), Plant tolerance for this insecticide was quite good. Two appli- 
cations at an interval of one week produced no apparent injury to ager— 
atum, Boston fern, calendula, chrysanthemum, coleus, cowpea, croton, cy— 
clamen, nasturtium, pepper, and pachysandra. Snapdragons were very 
Slightly injured; geraniums and maiden-hair fern were definitely in-— 
jured, but recovered," 
Mrs. L. T. Kessels and A. N. Cressman have continued seasonal— 
history counts on the camphor scale and submit the following table which 
offers a comparison with previous years: 
L326 1oRy. ml928 193i 
Peak-of Nroducine ic. sept. 5 July 26 Sept. 1 Octvag 
Pont eOt ltrs i721 hS.en mee eos: sept. 10 Aug. 20 sept.15 ’ OctarsS 
Paak Of Socond instar. cesses Oct. i sept. 5 Oct. 1ll° Novem 
From this table "it is seen that the scale this year is roughly one 
month later than in 1926 and 1928, and two months later than in 1927. 
In 1927 there was a partial fourth brood." 

