. The American florist : a weekly journal for the trade. Floriculture; Florists. 816 The American Florist. Nov. ij, been extracted or the tissue eaten by the insects.—Ed. A. F.] Injury ef- fected by the thrips is due to the method of feeding on the plants. Adults and larvffi both obtain their food by puncturing the epidermis of the leaf with their sharp mouth- parts,- and after lacerating the tissue they suck out tissue and plant juices at the point of attack. The insects then attack the leaf in a new place, so that in time it becomes full of tiny, pale-colored spots where the tissue and chlor
. The American florist : a weekly journal for the trade. Floriculture; Florists. 816 The American Florist. Nov. ij, been extracted or the tissue eaten by the insects.—Ed. A. F.] Injury ef- fected by the thrips is due to the method of feeding on the plants. Adults and larvffi both obtain their food by puncturing the epidermis of the leaf with their sharp mouth- parts,- and after lacerating the tissue they suck out tissue and plant juices at the point of attack. The insects then attack the leaf in a new place, so that in time it becomes full of tiny, pale-colored spots where the tissue and chlorophyll have been extracted. In the case of croton plants, upon which this insect was studied, injury was noticed first on the older leaves and gradually, as these became bad- ly infested, the injury spread until the youn" leaves were attacked, soon after unfolding. The infested leaves first showed injury on the underside, where the surface appeared full of minute white spots. As attack con- tinued, these spots became more nu- merous and united, forming hlotohes where the leaf was devoid of tissue. The injury then became apparent from the upper side, as the surface devel- oped a twisted and distorted aspect between the lateral veins, and was finally evidenced by wilted and dead areas around the edges of the leaf. In severe attacks the insects spread to the upper surface of the leaves, and in a short time this as well as the underside is nearly devoid of color. Both surfaces become thickly covered with minute drops of reddish fluid voided by the thrips, which grad- ually change to black. As the attack continues, the leaves become limp and yellow and eventually drop off, so that plants that were not treated to pre- vent injury in many cases lost their entire foliage. The injury is similar on other ornamentals. This insect in- jures plants in two ways: First, it causes a serious drain on the vitality of the plant from the feeding of thou- sands of thrips, so that the growth
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
