SPRAYING FOR THE CONTROL OF INSECTS AND 

 MITES ATTACKING CITRUS TREES IN FLORIDA. 



CONTENTS. 



Page. : Page. 



Success of insecticides and spray schedules 3 Insecticides Continued. 



Citrus insects and mites of importance 3 Sprays for red spiders and rust mites 21 



Losses resulting from insect attack 4 Softening hard water 23 



Methods of controlling citrus pests in Florida . 4 Factors in obtaining successful results 23 



Fumigation and spraying 4 Preliminary campaign 23 



Fungi 5 Spraying procedure 25 



Spraying coming into greater favor 6 Spraying schedule recommended 30 



Reasons for bad results in the past 7 The effect of insecticides on pests 32 



Equipment for spraying 8 Spray injuries 33 



Insecticides 16 I Cost of spraying 35 



Insecticides for white Hies and scale insects. . 16 ' Profits from spraj-ing. 36 



SUCCESS OF INSECTICIDES AND SPRAY SCHEDULES. 



RELIABLE INSECTICIDES for the control of insects and 

 mites atta clang citrus trees in Florida have been developed and 

 tested on a large scale. These insecticides, and the spray schedule 

 now recommended for citrus groves, have been used with success 

 for four years. 



The best argument in favor of the sprays and spraying scheme 

 discussed in this bulletin is to be found in the difficulty the writer 

 has had in securing the same grove for demonstration spraying two 

 or three years in succession. Once the owner of a grove has seen 

 the benefits resulting from careful and well-timed spraying he refuses 

 to accept the losses that he knows will come to him through the set- 

 ting aside of blocks of trees to be left unsprayed for comparison with 

 those sprayed. 



CITRUS INSECTS AND MITES OF IMPORTANCE. 



Of the total damage caused to citrus trees by insects and mites in 

 Florida, more than 95 per cent may be attributed to six species. 

 These are, in the order of their destructiveness, the citrus white fly 

 (figs. 1. 2. 19), * the purple scale (fig. 4), 2 the rust mite (fig. 6), 3 the 

 Florida red scale (figs. 4, 5), 4 the cloudy-winged white fly (fig. 3), 5 

 and the red spider or six-spotted mite. 6 There are several other pests 

 of minor importance, such as the woolly white fly, 7 the purple mite, 8 

 and the chaff scale. 9 The citrus white fly, the most injurious of pests, 



1 Dialeurodes citri (Ashmead). *Tetranychus sexmaculatus Riley. 



- Lepidrj*<ii>Ji<x beckil (Newman). 7 Aleurothrixus howardi (Quaintance). 

 3 Phyllocopteft oleivorus (Ashmead). 8 TetranycTiim citri McGregor. 



* Cliry *<j nip halu. s nonidum (Linnaeus). Parlatoria pergandii Comstock. 

 5 Dialeurodea citrifolii (Morgan). 



