. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. u /^TT^nTTO -ryntTTTrrrr^ y^ r'^ A /"* rr% /~* r^^ « jr»^ -»^» /-^ v^xxxvijo rivuiiO UN O U l^r-l^Ui\vM MAllih §2« part of Florida and latest in the Northern part of Florida along the gulf coast. In Florida there will sometimes be a fourth incomplete brood in January if the weather is warm. Toward the end of summer the broods begin to overlap, belated mem- bers of the second brood flying with precocious members of the third, so that during the latter part of the season there are some adults to be foimd on the trees at all tim
. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. u /^TT^nTTO -ryntTTTrrrr^ y^ r'^ A /"* rr% /~* r^^ « jr»^ -»^» /-^ v^xxxvijo rivuiiO UN O U l^r-l^Ui\vM MAllih §2« part of Florida and latest in the Northern part of Florida along the gulf coast. In Florida there will sometimes be a fourth incomplete brood in January if the weather is warm. Toward the end of summer the broods begin to overlap, belated mem- bers of the second brood flying with precocious members of the third, so that during the latter part of the season there are some adults to be foimd on the trees at all times. 5. In the United States there are not many insect enemies of the common citrus white fly to hold it in check. Ladybird beetles eat a few, as do also the young of the lace-winged fly. Fig. 7 and of a species of thrips. Fig. 7 shows the adult lace-winged fly, the larva, and eggs. The eggs of this fly are borne on stems attached to the leaf, as shown in the illustration. Fungous enemies are very efficient in holding the citrus white flies in check. During the hot and rainy season in Florida, which usually begins in June and lasts into vSeptember, fungi flourish. Many kinds of fungi grow on insects and kill them. Four different kinds of fungi live as parasites on the larvas of the citrus white fly. One of these, called the red asckersonia, §28 crrRUS FRUITS IN GULF-COAST STATES forms on the larva a bright-red pustule, or pycnidium, which is a spore-bearing receptacle. The red aschersonia fungus much enlarged is shown in Fig. 8 growing on a larva of the citrus white fly. This fungus is very conspicuous on the surface of green leaves, as shown in Fig. Q. Another fungus known as the brown fungus, produces a similar ])ustule of a brown color. This fungus sends out microscopic threads, which, if not checked by dry weather, will extend to all parts of the leaf and kill all white-fly larvas present. These threads often extend around to the upper surface of the leaf, where they
Size: 1569px × 1592px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectcitrusfruits, booksubjectfruitcultur
