Poinsettia Solutions PGR Solutions Insect Solutions Disease Solutions Quick Ref. Guide

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White grubs are general names for larvae of several species of beetles. Some of the more important white grubs in nurseries include the Japanese beetle, green June beetle, May beetle, European chafer, Oriental beetle, Asiatic garden beetle and rose chafer.

Larvae are C–shaped and have three pairs of legs. The larvae can be quite large, about 1–2 inches when fully developed. The larvae damage plants by feeding on plant roots. Some (e.g. Japanese beetle) are quarantine pests, requiring special treatment before plants can be shipped. The adults of some species feed during the day, others feed at night – usually on leaves and flowers.

White grub larvae develop in the soil. There usually is one generation per year, but some species (e.g. May–June beetles) have two year larval development cycles where adults emerge every three years. Adult emergence is in the spring and summer. After mating, eggs are deposited in/on the soil, and larvae move down into the soil to feed following egg hatch.

Discus™ – Nursery Insecticide
For larval control, apply 13.5 to 17 fluid ounces per 1000 feet of row or 3000ft2 as a banded spray to the soil surface, followed by irrigation or rainfall to move the active ingredient to the root zone. Use at least 2 gallons of spray volume per 1000 ft2; OR mix 13 fluid ounces (385 ml) in the appropriate amount of water for containers (see label). Apply when adults are laying eggs to target the very young larvae – May through July.

Marathon® II – Systemic and Translaminar Insecticide
For larval control, apply 1.7 fluid ounces (50 ml) per 1000 feet of row or 3000ft2 as a banded spray to the soil surface, followed by irrigation or rainfall to move the active ingredient to the root zone. Use at least 2 gallons of spray volume per 1000 ft2; OR mix 1.7 fluid ounces (50 ml) in the appropriate amount of water for containers (see label). Apply when adults are laying eggs to target the very young larvae – May through July. Shake well before use.

Marathon® 60WP in WSP – Systemic Insecticide
For larval control apply one 20 gram packet per 1000 feet of row or 3000ft2 as a banded spray to the soil surface, followed by irrigation or rainfall to move the active ingredient to the root zone. Use at least 2 gallons of spray volume per 1000 ft2; OR mix one 20 gram packet in the appropriate amount of water for containers (see label). Apply when adults are laying eggs to target the very young larvae – May through July.

Marathon® 1% G – Systemic Insecticide
Apply 45 ounces per 1000 feet of row or 3000ft2 as a uniform band on the soil surface. See label for container application rates. Apply when adults are laying eggs to target the very young larvae – May through July