. Control of cyclamen and broad mites on Gerbera. Mites Control; Cyclamen mite Control; Gerbera Diseases and pests. 6 CIRCULAR 516, U. S. DEPT. OF AGRICULTURE by applications of sprays or dusts. Such fumigants as calcium cyanide, nicotine preparations, and naphthalene have not proved successful as control material because of the inacessibility of the cyclamen mite and its great resistance to these chemicals. Because the desirable va- rieties of gerberas are propagated vegetatively (by division of crowns), the infested plants are not discarded but are carried from year to year and are not freed
. Control of cyclamen and broad mites on Gerbera. Mites Control; Cyclamen mite Control; Gerbera Diseases and pests. 6 CIRCULAR 516, U. S. DEPT. OF AGRICULTURE by applications of sprays or dusts. Such fumigants as calcium cyanide, nicotine preparations, and naphthalene have not proved successful as control material because of the inacessibility of the cyclamen mite and its great resistance to these chemicals. Because the desirable va- rieties of gerberas are propagated vegetatively (by division of crowns), the infested plants are not discarded but are carried from year to year and are not freed of the cyclamen mite in the regular handling of the crop. HOT-WATER TREATMENT On the basis of experiments with heat treatments as a control for the cyclamen mite,3 gerbera growers were advised to immerse their. Figure 4.—The cyclamen mite in its several stages as it occurs in crevices among flower parts of gerbera plants in water at 110° F. for 15 or 20 minutes, but in two instances reports of incomplete control were received. Investigations of the methods employed in each case indicated that subsequent to treatment the plants were satisfactorily handled to prevent reinfestation, but in the treatment itself the plants were closely packed in a slatted crate such as is used for shipping lily bulbs, for immersion in water already heated by steam to 111° F. at the beginning of treatment. It appeared that the closely packed foliage would not permit rapid enough pene- tration of hot water to kill the mites during the period allowed. 3 Smith, Floyd F. the cyclamen mite and the broad mite and their control. U. S. Dept. Agr. Cir. 301, 14 pp., illus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smith, Floyd F. (Floyd Franklin), 1900-. Washington, D. C. : U. S. Dept. of Agriculture
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