Rosemary Plants and Bugs

Written by gabrielle morgan
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Rosemary Plants and Bugs
Bugs are a common problem for rosemary grown outdoors. (Jupiterimages/ Images)

Bugs on rosemary plants pose a threat to the plant's health. Unattended to, the bugs may spread to other plants in the garden or invade the home when harvesting. Identify and eliminate bugs common to rosemary plants to keep the plants healthy.


The most common bugs that harm rosemary plants are aphids, spider mites, whiteflies and mealybugs. Ladybirds are particularly beneficial around rosemary plants, as they feed on the aphids.

Rosemary Plants and Bugs
Beneficial bugs help prevent infestation from harmful bugs. (ladybug image by Carol Wingert from


An increase in beneficial insects is one indication that harmful bugs may be attacking the rosemary plants. Check the plants for signs of bugs, many of which are visible, particularly on the stems, under leaves and at the base of the plant. Examine the rosemary for dead or brown leaves and stems, another sign that bugs are eating the plant.

Rosemary Plants and Bugs
Check the leaves, stems and ground for signs of bugs. (rosemary image by hazel proudlove from


Spray the bugs with insecticidal soap or a solution of 1 cup water, 1/2 tsp dish soap and 1/2 tsp vegetable oil. Thoroughly rinse the plants off after the bugs die. Immediately trim and remove all dead leaves and stems to prevent reinfestation.

Rosemary Plants and Bugs
Spray aphids and other harmful insects to prevent them from killing the rosemary. (reed aphids image by Adrian Hillman from

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