December, "08] JOrRNAL OF ECONOMIC ENTOMOLOGY 377 



such as Lawson. Enchantress and Bradt may also prove to be advan- 

 tageous. 



The temperature necessary for successful carnation culture is quite 

 favorable for the development of insects and diseases common to 

 carnation plants. For this reason the future of Pediculopsis gram- 

 inum and the associated fungus, Sporotrichum, pore, as parasites of the 

 carnation, will be watched with considerable interest. 



EXPERIMENTS FOR THE CONTROL OF THE RED 



SPIDER IN FLORIDA (TETRANYCHUS BI- 



MACULATUS, HARV.) 



By H. M. Russell, Bureau of Entomology, Washington, D. C. 



During the early spring of 1908, it was very dry for weeks in Flor- 

 ida, with little rainfall. Under these conditions red spider injury to 

 truck, general crops, and citrus trees was very noticeable. The writer 

 found a small field of wax beans very badly infested by the red spider, 

 May 16, 1908. Some of the leaves were badly distorted and curled, 

 and discolored by numerous yellow blotches, while others were dried 

 up and lifeless from the work of this insect. The red spider lives on 

 the under side of the leaves, spinning a slight web of delicate threads, 

 under the protection of which it feeds. 



About the first of June the rainy season in Florida set in and when 

 the plants were examined about a week later, the red spider had al- 

 most disappeared. 



Experiments for the control of the red spider were conducted at 

 Qrlando, Fla., from May 22, until June 1, 1908, the results of which 

 are summarized below. 



Experiment No. 1. — May 22, 1908. Lime-sulphur (at the rate of 

 1 pound of lime and 1 pound of sulphur to 25 gallons of water,^ a) 

 was sprayed on a row of wax beans, using an underspray. This was 

 at 5.30 p. m., the sky being cloudy, and a fair breeze blowing. On 

 ]\Iay 28, a number of leaves of sprayed plants were examined as were 

 leaves of unsprayed plants also (for the purpose of checking), with 

 the following results : 



'In Circ. 65, U. S. Dept. of Agriculture, Bur. Ent, Prof. E. S. G. Titus states 

 that the heat generated by slaking lime will dissolve the sulphur. The writer 

 finds that, when made up in small lots, it is necessary to boil the two in- 

 gredients together as enough heat is not generated to dissolve the sulphur. 



