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The greyish green larvae of geranium sawfly larvae eat holes in geranium leaves during the spring and summer.
Geranium sawfly larvae
Sawflies are in the same group of insects as bees, ants and wasps (the Hymenoptera). They have caterpillar like larvae that feed on plants the adults are winged insects that can appear fly-like.
Although the damage on the foliage can be considered unsightly, it is generally not extensive enough to affect the plant’s growth or its ability to produce flowers and so this insect can be tolerated.
The larvae can be removed by hand. One way of capturing for the larvae is to slide a sheet of newspaper underneath the foliage and then tap it and collect any larvae that drop off.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
There are two generations a year of geranium sawfly with larvae present in May and September. Fully grown larvae pupate in the soil, the September generation overwintering in this state. Adults emerge in spring and lay eggs on the foliage.
Chemical labels explained
Chemicals: using a sprayer
Chemicals: using safely and effectively
Large rose sawfly
Rose leaf-rolling sawfly
Solomon's seal sawfly
Social pear sawfly
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