Japanese Beetle Life Cycle

The adult measures 15 mm 06 in in length and 10 mm 04 in in width has iridescent copper colored elytra and a green thorax and head. Both as adults and as grubs the larval stage japanese beetles are destructive plant pests.

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Japanese Beetle Life Cycle

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Observing japanese beetles feeding on plants is quite common since the adult beetle feeds on about 300 species of trees shrubs ornamental and fruit trees in addition to vegetable crops.

Japanese beetle life cycle. A japanese beetles life cycle comprises the egg grub pupa and adult stage. Life cycle japanese beetle grubs spend the winter underground in the soil of lawns pastures and other grassy areas. The japanese beetle popillia japonica is a species of scarab beetle.

In spring grubs move up near the soil surface to finish feeding and pupate into adult beetles. Pupa stage is the dormant phase of the japanese beetle life cycle. Adult beetles start to emerge from the ground in late june or early july.

Adults feed on the foliage and fruits of several hundred species of fruit trees ornamental trees shrubs vines and field and vegetable crops. So first a quick primer on the japanese beetle life cycle. To control japanese beetles effectively its important to know when theyre active.

The grub stage can further be sub divided into three instar stages and is the longest of all stages in the life of a japanese beetle. Using a pest control product at the wrong time of the pests life cycle is a waste of time and money. The egg larva and pupa life cycle stages develop underground and unless soil is removed or dug into these life stages will not be seen.

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