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Home → Publications → Tree Planters' Notes → Tree Planters' Notes Volume 24, Number 1 (1973) → Systemic insecticides effective against poplar tentmaker in cottonwood plantations

Systemic insecticides effective against poplar tentmaker in cottonwood plantations

I n late 1970, the poplar tentmaker, Ichthyura inclusa Hiibner, became very abundant in succulent rapidgrowing eastern cottonwood plantations along the Brazos River in Burleson County, Tex. The larvae construct characteristic nests by webbing individual leaves together (fig. 1) . In Texas, each leaf nest contained 10-30 larvae. The caterpillars emerge from the nests and feed on the foliage, leaving only the midribs and major veins of the leaves. Open-grown trees are favored by the insects (2). Tests were already underway in the infested areas to evaluate several systemic insecticides against the cottonwood twig borer, Gypsonoma haimbachiana Kearfott (3), on the same plots where extensive poplar tentmaker defoliation was observed. No previous reports of the effectiveness of systemic insecticides against the poplar tentmaker are known, although quassia, a botanical insecticide, showed systemic activity against these insects (1) .


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Author(s): Jack E. Coster

Publication: Tree Planters' Notes - Volume 24, Number 1 (1973)

Volume: 24

Number: 1