. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 90 WHITE FLIES INJURIOUS TO CITRUS IN FLORIDA. infested area is not generall}" infested, iuu\ the same ])recaiitions should be observed within this area as outside of it to avoid unneces- sary spread of the pest. FOOD PLANTS. Tlie cloudy-winged white fly is not known in Florida to ])reod upon any other food plant than citrus. It has recently been dis- coA^ercd infesting the rubber trees {Ficus nitula) growing in the green- houses in Au(kd)()ii Park, New Orleans. Extensive examinations for possible footl plan
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 90 WHITE FLIES INJURIOUS TO CITRUS IN FLORIDA. infested area is not generall}" infested, iuu\ the same ])recaiitions should be observed within this area as outside of it to avoid unneces- sary spread of the pest. FOOD PLANTS. Tlie cloudy-winged white fly is not known in Florida to ])reod upon any other food plant than citrus. It has recently been dis- coA^ercd infesting the rubber trees {Ficus nitula) growing in the green- houses in Au(kd)()ii Park, New Orleans. Extensive examinations for possible footl plants have been made by the authors and by Dr. Berger, and it is reasonably certain that no important food plant will b(» found in Florida citrus- growing sections which will interfere with the control of this species. Examinations of prickly ash {Xan- tJioxylum ckiva-lier- culis), the most com- mon representative of the family Ruta- cese to which the citrus belongs, indi- cate that this species of white fly never breeds on this plant, regardless of the con- dition of infestation of neighboring citrus trees. Reports of blacken- ing of the foliage of prickly ash })y the white fly in sections where only the cloudy-winged white fly of the two herein treated occurs, are doubtless erroneous and probably based upon the blackening due to an aphis or to some other insect. In addition the following plants have been examined under favorable conditions to determine if sub- ject to attack by the cloudy-winged white fly, but so far without results: China trees and umbrella diina trees, cape jessamine, privets, Japan and wild persimmons, oaks, wild cheny, guava, fig, grape, cherry laurel, blackberry, and magnolia. SPREAD. The (hssemination of the cloudy-winged white fly is limited by the same factors which have been discussed as unfavorable to the suc- cessful establishment of the citrus white fly. Aside from these factors. Fig. 13.—Map showinp; dislribtilion of the cloudy-winged white fly (
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