64 



has destroyed red spiders on a cucumber plant without injury to the 

 plant. Three fumigations, using Potassium cyanide at the rate of 

 .01 gram per cubic foot of space, and with an interval of two weeks 

 between each fumigation, should practically rid the house of the 

 pest. 



When undesirable to use hydrocyanic acid gas, a combination 

 of fumigation with Nicoticide and syringing with a solution of Bow- 

 ker's Tree Soap seems to be the best substitute. 



The Strawberry Aleyrodes. 



This insect has been known for many years, and has been re- 

 ported from various parts of the Eastern United States. 



It was formerly believed to be identical with the greenhouse 

 Aleyrodes, but it is now known to be distinct. Differences between 

 the two species have been found in all stages except the egg. 



This insect passes the winter in the egg stage on the under side 

 of strawberry leaves. The eggs hatch in the spring and the earliest 

 adults appear from the first to^the middle of May. 



Many of the larvae are destroyed by frosts and by starvation, 

 due to the leaves to which they are attached and from which they 

 are unable to move, drying up before the insects reach maturity. 



In some cases it proves a serious pest. 



Preventive measures are necessary if the treatment is to be fol- 

 lowed by good results. These consist in using care in the location 

 of new fields in growing plants for propagation in nurseries, etc. 



The simplest and cheapest remedies consist in treating the 

 plants in the nursery. The old wintered over leaves should be re- 

 moved not later than the first of May. As all the insects are con- 

 fined to these leaves up to this time the plants will be freed from the 

 insect in proportion to the thoroughness with which these are re- 

 moved. It is necessary to combine the preventives with this remedy. 



If the insect becomes so abundant in the field as to require 

 treatment, spraying with kerosene emulsion or whale oil soap, using 

 an underspray nozzle, is recommended. 



