The following is a partial list of plants severely injured by the Japanese beetle: elm, maple, grape vine, peach, apple, apricot, cherry, plum, rose, zinnia, corn, asparagus, soybean, blueberries, raspberries and blackberries. Photo Credits: J. Baker, D. Cappaert, S. Katovich Bugwood. There is only one generation per year. Adults appear in summer and are very active for about 6 to 8 weeks. In the Niagara area they begin to emerge from the soil in late June or early July, but do not reach their peak until late July and August, then gradually disappear.
Their normal life span is from 30 to 45 days. They feed on fruit and foliage of a great variety of plants. Their flight is aimless except in response to chemical stimuli of food plants or sex pheromone.
Most flights are short distances, but the beetle is capable of flying up to 8 kilometres with the wind. There is little feeding on cloudy and windy days and no feeding on rainy days.
Beetles prefer to feed on plants exposed to the direct rays of the sun, beginning at the top, regardless of height, and working downward. They feed on the upper surface of the foliage of most plants, chewing the tissue between the veins, leaving a lace-like skeleton.
During the first week to 10 days after emergence feeding is confined to low growing plants, then progresses to fruit and shade trees.
Potter and L. Toggle navigation GardenTech. Find a Product. Identify Your Pest. About Us. Contact Us. Century-Long Invasion. Life Cycle Lessons. Early, diligent treatment prevents plant damage and grub-producing eggs.
Follow label instructions for your chosen product , including time allowed between application and edible harvests. For grubs — Get maximum impact by treating in mid-to-late summer, when grubs are newly hatched, small and actively feeding near the surface. Treat again in early spring, when overwintering grubs move back near the surface, before they pupate and emerge in beetle form. Check the label for PHIs on any edibles in your landscape. Then they continue protecting your landscape for up to three months.
Sevin is a registered trademark of Tessenderlo Kerley, Inc. Sources: 1. Get Monthly Gardening Advice! The eggs can be deposited in decaying leaves, rotten wood and even animal feces. Some beetles keep their eggs inside and give birth to live larvae.
Beetle larvae are grub or worm-like in appearance and have voracious appetites. It is in this stage that wood-destroying beetles, such as powderpost and Longhorned beetles, do their damage to structures. The larvae of these beetles feed on the cellulose structure of timber, eating the wood from the inside out. As the larvae begin to grow, they need to discard the outer covering of their bodies, known as the exoskeleton, to provide more room.
This shedding, called "molting," may occur between seven to 10 times before the larvae enter the pupal stage. This stage of the beetle life cycle is where the greatest change in form takes place. The worm-like larvae form the pupa or cocoon as it often called, then lay dormant. During this stage, the larva begin to take the shape of the adult beetle.
The time period to reach adulthood from the pupal stage varies dramatically among different types of beetles. Some take as little as 30 days while others may take up to two to three years to fully develop.
Once adulthood is reached, the fully mature beetle emerges from the cocoon and begins another life cycle all over again. The adult stage is the final stage in the life cycle of a beetle. Adults are found in many sizes, shapes and colors. Some adults have large mandibles for catching their prey and for defense from predators. Some species, such as the Cerambycid beetle, resemble wasps to fool predators in to staying away. Other species can emit poisonous or distasteful substances to ward off their enemies.
Understanding the beetle life cycle may help you better identify any that you may find in or around your home.
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