Word: larval
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Dates: during 1910-1910
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...practically free from insect pests in past years and it is only during the last few years that there has been any trouble at all. The first troublesome insect was the elm-leaf beetle. It is a small beetle which feeds on the leaves of the elms, in its larval stage, appearing in such numbers as to strip the trees entirely of their foliage, thereby killing them. The trees in the west part of the Yard were attacked by this pest and considerable damage was done before they were overcome...
...leopard moth, which was first noticed in June 1909 is an imported European pest, and is only injurious in its larval stage. The life of the larva is two years. It makes its way into the tree by boring through the bark where it may make great furrows in the growing layer, thus girding the limbs, or it may burrow deeper into the heart of the tree. Its burrows show that it migrates often, from one part of a branch to another or to a different one altogether...