Mealybugs can be difficult to control, but a combination of methods will effectively reduce or eliminate infestations. Begin by manually removing mealybugs with alcohol-dipped cotton swabs or by using a forceful water spray to dislodge them from plant surfaces. Repeat these methods as needed, as they help control small populations and have no negative impact on beneficial insects[2][5].
Encouraging or introducing natural predators such as ladybug beetles, green and brown lacewing larvae, mealybug destroyers (Cryptolaemus montrouzieri), spiders, and minute pirate bugs is highly effective for outdoor infestations. Avoid unnecessary insecticide use to preserve these beneficial insects[1][2][3][4].
Pruning heavily infested plant parts is another practical approach; dispose of removed plant material immediately to prevent re-infestation. In extreme cases, consider discarding severely affected plants, especially if root infestation is present[3][5].
Physical and cultural controls are important for prevention: regularly inspect new plants before introducing them to your garden, quarantine new arrivals for 2–3 weeks, and check containers and tools for hidden mealybugs or eggs. Avoid the use of nitrogen-rich fertilizers, as lush new growth attracts mealybugs[1][2].
Control ants, as they can transport mealybugs to uninfested plants. Use physical barriers or targeted baits that do not harm beneficial insects[2][6].
If manual and biological controls are insufficient, use insecticidal soap or horticultural oil sprays, taking care to follow all label directions and to spray thoroughly in hard-to-reach places where mealybugs hide. Repeat applications as necessary. Neem oil is another commonly used option. For severe infestations, chemical insecticides such as acephate (Orthene), bifenthrin, or pyrethrins may be used with caution, though mealybugs’ waxy coatings can reduce effectiveness and chemical methods should be a last resort[2][3][4][5].
Remove overwintering sites like loose bark to reduce mealybug numbers and maintain good gardening hygiene to limit re-infestation[6].
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