SPRAYING FOR CITRUS IXSECTS AND MITES IN FLORIDA. 



tion excellent as it is under weather conditions such as exist in 

 California is not promising in Florida, where the dormant season 

 for citrus trees is too short to permit of the advantageous use on 

 a large scale of 

 fumigating outfits. 

 There are also 

 other objections to 

 the general adop- 

 tion of fumigation 

 for the a v e r a g e 

 grove in Florida. 

 On some groves, 

 however, fumiga- 

 tion 1 could be used 

 successfull. 



FUNGL 



There are a num- 



FIG. 2. Pupae and pupa cases of the citrus white fly. The 

 pupa cases do not collapse after the adult emerges, like 

 those of the cloudy-winged white fly. but remain rigid. 

 ber Of beneficial (Morrill and Back.) 



fungi that kill insects in Florida. These do an immense amount of 

 good and should be present in every grove in the State. The most 

 valuable of those killing citrus insects are the red-headed - and gray- 

 headed 3 fungi that 

 kill the purple 

 scale, and the red 

 (fig. 7), 4 yellow. 5 

 brown (fig. 8), 6 and 

 white - fringe 7 

 fungi that kill the 

 white flies. Under 

 the most favorable 

 climatic conditions 

 these fungi keep 

 the insects well in 

 check. These fa- 

 vorable conditions 

 usually do not ob- 

 tain, and both scale insects and white flies become abundant and 

 cause much damage, often before a grower realizes the true situation. 

 These fungi are active about five months during the rainy season in 

 summer, leaving many of the injurious insects to multiply unchecked 



1 Morrill, A. W. " Fumigation for the citrus white fly, as adapted to Florida condi 

 tions." U. S. Dept. Agr., Bur. Ent. Bui. 76. For sale by Superintendent of Documents, 

 Washington, D. C., for 15 cents. 



- Sphacrostilbc coccophila Tul. B Aschersonia flaro-citrina P. Henn. 



3 Ophionectria coccicola E. & K a Aegerita trebbfri Fawcett. 



4 Aschersonia aleyrodis Webber. ~ M icrocera sp. 



FIG. 3. Pupa cases of the cloudy-winged white fly. They are 

 very filmy, collapse after the adult emerges, and fall easily 

 from the leaf. (Morrill and Back.) 



