Understanding the life cycles of turf-damaging beetles can determine timing and selection of grub control products. Oriental beetles feeding on rose flowers Life Cycle Removal of woody ornamentals and perennial host plants attracting adults is sometimes not practical. Females then lay eggs in the soil nearby and chronic damage from year to year may result near host plants. Sometimes the beetles are attracted to certain plants in the landscape (such as roses, Japanese maple, grapes, Zinnias, Mountain ash and other plants for the Japanese beetle). Extended drought conditions may reduce grub populations as eggs may dry out enough to prevent hatching. Some years are favorable to certain species depending on weather conditions as eggs are being laid. Monitor known food plants of adults in the area by day, or use lights to attract night- flying adults. To determine if populations of adults are in high enough numbers to be a potential grub problem in lawns, scouting can be done. Some are night flyers and can be attracted to lights, while Japanese beetles are active during the day and may be seen feeding on the leaves of over 300 plants.The adults of these beetles do not feed on grass leaves, however. Japanese beetles, European chafers, Oriental beetles and Asiatic garden beetles are the most common turf damaging beetle pests found in Connecticut. Most beetles that are turf pests are non-native. Detection of grubs can be difficult when grass is dormant or when rainfall or irrigation keep grass green while grubs are feeding below the ground.
These white grubs feed on the roots of grasses and other plants and damage can be severe when large numbers are present. One of the most commonly-encountered insect pests of turf in the North East are the larva of certain scarab beetles.
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