Tartar Emetic as a Field Spray Against the Gladiolus Thrips

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Abstract
The most commonly used sprays for field control of the gladiolus thrips, Taeniothrips simplex, are arsenical combinations containing brown sugar or other sweetening. These often burn the gladiolus foliage. Tartar emetic in combination with brown sugar and with a spreader-sticker was compared with Paris green combined with the same materials in these tests. Pertinent data were subjected to an analysis of variance. Combinations of tartar emetic and brown sugar do not injure gladiolus foliage, result in thrips control equal to that obtained with Paris green and brown sugar and do not affect new corm production; an effective mixture of tartar emetic and brown sugar is less expensive than a spray of Paris green. With the tartar emetic the amount of brown sugar can be reduced to 1/4 of that commonly used with arsenicals without affecting the control obtained. Apparently the sprays must be sweetened, since the substitution of a spreader-sticker for the brown sugar resulted in poor control with both tartar emetic and Paris green.

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