Camnula pellucidaFootnote 1
All trees and shrubs
Appearance and Life Cycle
Grasshoppers overwinter as eggs in the soil, emerging as nymphs in May to June. Nymphs are approximately 3-5 mm long and resemble the adult stage, except for size and undeveloped wings. Immediately after emerging, they begin feeding on surrounding plant material. Nymphs undergo five molts (shed their skins) over a 3-8 week period, to reach the adult stage. Two weeks after mating, the females lay cream to orange-coloured, elongated eggs in the top 5 cm of soil. Each female produces an average of 250 eggs in a life cycle. Grasshoppers will continue to feed and lay eggs until cold weather kills them. In Canada, grasshoppers have one generation a year.
Grasshoppers are general feeders and will feed on all species of trees and shrubs, including conifers, when normal food supplies are low. Generally, grasshoppers eat only the leaves and cause no permanent damage. However, in severe cases, when conifers are completely defoliated or when the bark of young trees is girdled, damage is fatal.
Because of repeated swarms, several applications of insecticide are usually required for control. Insecticides available include: carbaryl; carbofuran; chlorpyrifos; cypermethrin; deltamethrin; diazinon; dimethoate and malathion. If only a few ornamental trees are being attacked, they can be covered with burlap, wire screening or thin fabric. These coverings protect the trees, while allowing entry of light and air.
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