3 IN 1 is an organic concentrate that will both kill mealybugs but also control fungus. As these wasps appear, they’ll feed on the mealybug populations and help bring down their numbers and control them. Control methods. Appearance What do they look like? Scale insects and mealybugs are plant-feeding pests considered by landscapers and nursery producers to be among the most difficult to control. These white colored devils are quite hard to get rid of once they’ve found a good food source they settle down reproduce rapidly and destroy a healthy plant in no time at all. fine, it is still a good idea to quarantine them for about two weeks anyway. As soon as you see the first signs of insects, isolate that succulent to prevent their spread to your other plants. Avoid over-fertilization to control mealybugs. Mealy bugs are those soft bodied white cotton-like pests that suck the juicy sap out of plants. This will cause the mealybugs to move to the leaf furthest from the window, where they can be wiped off with a cloth. Preventing Mealybugs on Outdoor Plants. Parasites provide good control of the citrophilus, longtailed, and Comstock mealybugs if they are not destroyed by insecticide applications for other pests.Native predators include lady beetles, lacewings, and syrphid flies.An introduced predator of the citrus mealybug, the mealybug destroyer, Cryptolaemus montrouzieri, is a voracious feeder of the pest in both the larval and adult stages. To effectively control mealybugs with soapy sprays, it helps to understand the insects' anatomy and life cycle. Mealybugs are very small, soft-bodied, oval-shaped insects that are covered with a white, powdery wax coating. This can be helpful when the affected plant has both the pest and the fungus. Mealybug destroyer beetle (mealybug ladybird) is a non-spotted species of ladybug that prefers mealybugs. If you have enough of these plants and wasps in the area, you can effectively reduce and eliminate the mealybugs and control future infestations. The citrus mealybug, (Planococcus citri) and longtailed mealybug (Pseudococcus longispinus) are two of the more common species.Less common and more difficult to control is the Madeira mealybug (Phenacoccus madeirensis).There are even mealybugs that feed upon plant roots! Like mealybugs, aphids secrete a sweet substance known as honeydew which will attract ants. If the infested plant can tolerate the cold, the plant can be placed on a windowsill during cold weather. The most common is sooty black mold but there are many fungi that will live alongside mealybugs. Follow these agricultural tips to prevent and reduce populations of mealybugs in the garden: Mealybugs Facts, Identification & Control Scientific Name. Beneficial cultural practices can also be used for outdoor mealybug control. In many cases, mealybugs will enable fungus to grow. 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