96 Anfiah of Hortiailhtre . 



inches in diameter, I first sprinkle about four ounces of 

 sulphur upon the ground close around the foot of the tree. I 

 then pour about six quarts of the drench mixture upon the 

 sulphur around the root of the tree. The drench is absorbed 

 by the roots of the tree, and being carried to the bark and 

 leaves of the tree, combines with the wash above mentioned 

 which has been applied to the trunk, and the result is effec- 

 tive in destroying all insect life upon the tree, while the leaves, 

 bark and fruit remain uninjured.' Comment upon such a 

 patented mixture is needless !" 



Dr. Riley, Entomologist of the national Department of 

 Agriculture, presented at the meeting of the Association of 

 Economic Entomologists at Champaign, Illinois, in Novem- 

 ber, an extended report upon the "Outlook for Applied 

 Entomology," from which I make copious extracts: 



"The hydrocyanic acid gas treatment against scale-insects 

 is becoming more and more common in California, and has, 

 to a certain extent, superseded the use of washes, especially 

 against the red scale {Aspidiotus Aurantii). This is largely 

 due to the fact that recent experiments, carried on through 

 Mr. Coquillett, have resulted in a great cheapening of the 

 process. The expense has been reduced one-third, and the 

 bulky machinery mentioned in my report for 1887 has been, 

 for the most part, dispensed with. It has also been found 

 that the use of the process at night is safer and more benefi- 

 cial, in that it lessens the effect of the gas upon the foliage. 



"The repeated importation of scale-insects from Florida 

 into Cahfornia has attracted much attention. The species 

 concerned are principally the purple scale {Mytilaspis citricold), 

 the long scale {M. Gloverii^, and the chaff scale {Parlaforia 

 Fergandei). The fact that these insects must have been 

 repeatedly imported into the state in past years, without 

 obtaining a foothold, has been used as an argument against a 

 quarantine, and a great deal of discussion on the subject has 

 been had in the California papers. From my own observa- 

 tions in the state I am convinced that where the proper con- 

 ditions of shade and moisture obtain there is no reason why 

 these scale insects should not get a foothold, but that they 

 will probably die out in the hotter, drier, and less shaded 

 localities. An agent who was sent to Pomona to investigate 

 certain newly planted orange groves of Florida trees found 



