As mentioned in the previous article, this insect also causes browning of the leaves. Though this weevil does feed on other elms including American and Chinese elms, Siberian elm is preferred.
The adult of this insect is a very small (1/8 inch) brown weevil with dark spots on the back. It sports a short, curved snout and has the ability to hop.
Eggs from overwintering adults hatch on newly formed leaves. The larva produces a serpentine pattern in the leaf that terminates on a leaf edge. Adults emerged some time ago and are feeding on the leaves. Adult feeding damage produces a shothole pattern in the leaves. Heavily fed upon leaves appear lacy. Feeding can continue for a long period of time. There is one generation per year and so when the adults disappear, there should be no further damage this year.
I have not seen any control strategies for this insect. Trees typically recover from spring defoliations. (Ward Upham)
The adult of this insect is a very small (1/8 inch) brown weevil with dark spots on the back. It sports a short, curved snout and has the ability to hop.
Eggs from overwintering adults hatch on newly formed leaves. The larva produces a serpentine pattern in the leaf that terminates on a leaf edge. Adults emerged some time ago and are feeding on the leaves. Adult feeding damage produces a shothole pattern in the leaves. Heavily fed upon leaves appear lacy. Feeding can continue for a long period of time. There is one generation per year and so when the adults disappear, there should be no further damage this year.
I have not seen any control strategies for this insect. Trees typically recover from spring defoliations. (Ward Upham)
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