JOURNAL 



OF 



ECONOMIC ENTOMOLOGY 



OFFICIAL ORGAN AMERICAN ASSOCIATION OF ECONOMIC ENTOMOLOGISTS 



Vol. 8 APRIL, 1915 No. 2 



Proceedings of the Twenty-seventh Annual Meeting of the 

 American Association of Economic Entomologists 



{Continued) 



Afternoon session, Tuesday, Decemher 29, 1914, 2,00 p. m. 



Peesidext H. T. Fernald: We will now listen to a paper by W. 

 W. Yothers. 



SPRAYING SCHEME FOR THE CONTROL OF INSECT PESTS 

 ON CITRUS TREES IN FLORIDA 



By W. W. Yothers, Bureau of Entomology, Orlando, Florida 



Of the total damage caused by insects to citrus in Florida more than 

 95 per cent may be attributed to six species. The most destructive is 

 the citrus white fly (Aleijrodes citri R. & H.) which now infests nearly 

 all the groves in the state. The second most destructive pest is the 

 l^urple scale {Lejndosaphes heckii Xewm.) which is found in greater or 

 less numbers on every citrus tree in the state. According to my ob- 

 servations the rust mite {EriopJujes oleivorus Ashm.) ranks third. The 

 Florida red scale {Chrysomphalus aonidum L.), the cloudy- winged 

 white fly {Aleyrodes nuhifera Berger) and the red spider (Tetranychus 

 sexmacidatus Riley) are also of primary importance. It has been the 

 object for several years to perfect a spra^dng schem^e which would 

 largely eliminate the damage caused by these pests. There are also 

 several pests of secondary' importance such as the woolly white fly 

 {Aleyrodes howardi Q.) and the purple mite {Tetranychus mijtilaspidis 

 RilejOi which this spraying scheme will also partially or completely 

 control. 



■ As a general proposition the time to spray for the control of all 

 pests on citrus trees is when the}- are present in such numbers that, 



