Mealybugs, a cousin to other garden pests like scale and whiteflies, can damage many flowering and ornamental plants by direct feeding and by introducing diseases into the garden. Citrus mealybug is reported to lay up to 500 eggs contained in irregular cottony masses. Heavily infested plants are weakened from excessive sap loss and may die. Mealy bugs are the main concern and can be removed by dabbing them with a cotton swab dipped in rubbing alcohol. They feed on plants’ vital sap by inserting their needle-like mouthpart (stylet) and leave their hosts sabotaged. The honeydew also provides a perfect medium for sooty mould growth. Use with caution and read and follow all label directions. You’ve probably seen mealybugs at one time or another on the stems or leaves of a houseplant. They usually grow naturally in warm and humid climate. As mealybugs feed numerous waxy filaments start forming as white, threadlike projections located along the edge of the body. They are pink, soft-bodied insects covered with a white, waxy, cottony material. It also shows up consistently on rosemary, citrus, and bird of paradise. The eggs hatch into tiny, immature mealybugs called nymphs that move about on the plant searching for a place to settle and eventually insert their beaks into the plant and begin sucking out the sap. Mealy-bugs are also capable of transmitting diseases, including viruses. Like these, the mealybugs feed on the plant’s sap by extracting it through a long slender beak pierced into the plant tissue. When you’re trying to identify the tiny white bugs on your plants, here’s how you can tell if they’re mealybugs: Mealybugs have pinkish-purple bodies but often appear white or light gray once they cover themselves in a cotton-like wax. Some of the most common are scale insects and spider mites. Despite their name, whiteflies are not a type of fly, though they do have wings and are capable of flying. There are also some mealybug species found on plant roots. Glasshouse mealybugs are common insects that tend to live together in clusters in inaccessible parts of plants, such as leaf axils, leaf sheaths, between twining stems and under loose bark. as a growing medium for black sooty mold fungi. The body of each mealybug is oval and about 1/4 inch long. Mealybugs are one of the most destructive insect pests of greenhouse and interior plantscape environments. The phloem is the food-conducting tissue of plants. These ladybugs, originally from Australia, are mass-produced by several companies in the U.S. Mealybug females feed on plant sap, normally in roots or other crevices, and in a few cases the bottoms of stored fruit. Citrus mealybug (Planococcus citri) is the most common species found. If the plant is infected with spider mites, mealybugs (look like tiny bits of cotton), or aphids, gently clean the leaves of the poinsettia with an alcohol swab. As the population of whiteflies decreases, you can lower the frequency of washing to once every two or three weeks. Among houseplants, aglaonema, coleus, cactus, dracaena, ferns, ficus, hoya, jade, orchids, palms, philodendron, schefflera, poinsettia, and various herbs including rosemary and sage often have problems with aboveground mealybugs. Ames, IA 50011-2031
However, the soft, segmented body is concealed by filaments of white wax that cover the insect. Spray the plant weekly until the mealybugs are gone. The pests will attack a wide range of vegetation, including fruit trees, gardenias, African violets, and more. One of the commonly encountered mealybug species of greenhouses is the citrus mealybug, Planococcus citri (Figure 1). As attractive as this option seems, it is unlikely to be practical for homeowners with a few, relatively small plants or with a limited infestation of mealybugs. Mealybugs tend to congregate in large numbers at leaf junctures where the petiole meets the stem, on leaf undersides, on stem tips, and under the leaf sheaths of cer-tain plants such as orchids and the prayer plant (Maranta However, this should be done before the infection spreads or gets too large or you may never kill them all. Whiteflies are soft-bodied, winged insects closely related to aphids and mealybugs. 2150 Beardshear Hall
It takes a lot of spider mites to suck the juices out of a poinsettia leaf. The ladybug adults and larvae feed on the mealybug eggs and small nymphs. 2 Insects The main insect and mite pests of poinsettia are fungus gnats, whiteflies (including the greenhouse whitefly B, Q biotypes of Bemisia tabaci whiteflies, and silverleaf whitefly), two-spotted spider mites and Lewis spider mites. Poinsettias are subject to attack from insect pests and mites all season long, so effective management is a must for quality poinsettia production. If these little fuzzy white insects are present, remove them with a cotton swab dipped in alcohol. Another type of mealybug are Rhizoecus species, which are among the most difficult to control because they attack and feed on roots. The milky sap of the poinsettia may irritate skin, so wear latex gloves or handle the plant carefully when removing heavily infested leaves or plant parts. The best way to avoid a whitefly infestation on poinsettias and other plants is to thoroughly inspect plants for any signs of pest activity before purchasing or bringing them indoor. 3 Place the plant in a cool (not cold) room with curtain filtered sunlight and cut back on the watering. Easily recognized by a thin purple stripe down the middle of their back, they are densely covered with white wax and have very short tails. Once whiteflies are observed on a poinsettia, treating the infestation as quickly as possible allows the poinsettia to rapidly regain its health and attractive appearance. Mealybugs hide beneath leaves and flower petals, making their tiny bodies even harder to spot. The standard, well-known remedies for houseplant pests are often successful if applied with diligence and persistence. If you own a greenhouse, those white dots on your plants could well be mealybugs. Easy Seed Saving November 23, 2020 November 23, 2020 One last precaution: Mealy bugs are one of the few pests that bother poinsettias. How do I control mealybugs on a houseplant. Spray the poinsettia thoroughly with horticultural oil, insecticidal soap or another pesticide labeled for whitefly control on houseplants. Spray the poinsettia plant’s leaves with insecticidal soaps. Insecticide sprays are available for mealybugs and other houseplant pests. Mealybugs are common pests of houseplants. They may look like little fluffy cotton balls with legs, but the damage mealybugs can do on houseplants and in the outdoor garden is serious. Thrips can be found feeding on leaves early in the production cycle. Females form a fluffy white egg sac that is about twice the length of their body, shorter than that of the Madeira mealybug. Citrus mealybugs are considered phloem-feeders like aphids, whiteflies, leafhoppers and soft scales. A Simple Hydroponic Bucket System for Beginners November 24, 2020 . Picking off individual mealybugs and egg sacs or dabbing each one with an alcohol–soaked cotton swab may be satisfactory for lightly–infested plants. This was especially true when the heat came on in offices as […] Plant Pests: Scale & Thrips and How To Control Them says: 10/10/2019 at 6:17 pm […] 1 … These may contain any of several different ingredients, including insecticidal soaps, pyrethrin, neem, or a synthetic pyrethroid such as permethrin, bifenthrin or resmethrin. This insect is also a minor pest of lima beans in the warmer parts of the United States. Additional information on mealybugs and other common, houseplant pests is available in pamphlet Pm–1595, Houseplant Insect Control. Mealybugs are small insects covered with a white mealy coating; some have white hairs attached to their bodies. People with houseplants, gardens, and flower beds often encounter these pests. Mealybugs are common indoor pests. Pests that may be attracted to poinsettias include white flies, fungus gnats, mealybugs and spider mites. This chemical is taken up by the poinsettia and kills whiteflies as they feed on the plant. Mealybugs usually remain in one place for their entire life span of four to ten weeks. These pests are easily recognizable because they make your plant look like it has been dusted with a fluffy and sometimes powdery white substance. Whiteflies can be as small as 1/12 of an inch, are somewhat triangular in shape, and are often found in clusters on the undersides of leaves. White Spider Mites on an Indoor Star Jasmine. These tiny, segmented insects measure between 1/20- to 1/5-in. What is Mealy Bug. Apply oils or other insecticides carefully and according to manufacturer instructions. Among the most common of these pests are whiteflies. What Kind of Bug Affects Ficus Trees Indoors? Mealybugs are unarmored scale insects. How to Remove the Spout From a 174 Delta Kitchen Faucet, University of Illinois Extension: Poinsettia May Include Whiteflies, University of Minnesota Extension: Houseplant Insect Control, University of Rhode Island Landscape Horticulture Program: Poinsettias, Treatment of Plant Aphids With Diluted Dishwashing Liquid, How to Get Rid of Mealy Bugs on a Gardenia Houseplant. Lightly infested plants may only be stunted, yellowed or malformed. Sometimes their feeding will cause leaf distortion. These pests tend to attack either the plant itself or the social surface. They look like small white puffs of cotton or fluffy deposits of white powder. A Few Words About Whiteflies Whiteflies are the most important insect pests of poinsettia, and as such they are the Wash the whiteflies off of the plant weekly using a forceful stream of water directed at the undersides of leaves and other clusters of whiteflies. The poinsettia (Euphorbia pulcherrima) is prized as an ornamental around the winter holidays for its large, brightly colored bracts that are sometimes mistakenly referred to as the plant's flowers. It also addresses bothersome honeydew and sooty mold accumulations. Mealybugs may be difficult to control and unless the plant is particularly valuable, it may be best to throw away infested plants before the insects spread to other houseplants. Mealybugs sometime occur as well, but almost always on poinsettias produced adjacent to mealybug-infested crops. Spray the poinsettia thoroughly with horticultural oil, insecticidal soap or another pesticide labeled for whitefly control on houseplants. One application of neem oil probably won’t kill all the mealybugs on the plant. Oth-er insects that occasionally cause problems include shore flies, mealybugs, thrips and leafroller caterpillars. C. dichlorvos (products listing poinsettia on label) – for aphids, mealybugs, whiteflies (nymphs and adults), thrips, and spider mites. You’ve probably seen mealybugs at one time or another on the stems or leaves of a houseplant. Mealybugs are related to aphids and scale insects. Because mealybugs have a rapid lifecycle, you’ll need to routinely kill the newly-hatched bugs every week until all of the mealybugs have been killed off. She holds a Bachelor of Arts in urban and regional studies. Mealybugs excrete a sticky substance called honey dew which ants like to feed on. Copyright © 2020ISU Extension and Outreach
Common to poinsettias are red spider mites, which through sucking the plant’s sap cause the leaves to become pale and red-speckled. Ground mealybug infestations … (800) 262-3804, Iowa State University | PoliciesState & National Extension Partners, Like us at Plant and Insect Diagnostic Clinic, Like us at Department of Plant Pathology and Microbiology, https://store.extension.iastate.edu/Product/pm1595-pdf. They are common on African violets, Ficus, jade gardenia, poinsettia and other indoor plants. These bugs do not fly, so if the bugs fly off when the plant is disturbed, those are most likely whiteflies instead. Use aerosol or hand pump spray products made just for houseplants. Pest pressure varies by region in greenhouse poinsettias, but the most common insects include whiteflies, mealybugs, mites and thrips. Are poinsettias toxic to pets? Similarly, syringing the plants with a forceful spray of lukewarm water may adequately dislodge a light pest infestation. The filaments extend out from the periphery of the body and may be up to 1/2 inch long. What Are Whiteflies? Several pests and diseases are potentially problematic on poinsettias. Mealybugs suck sap from plants and then excrete the excess sugars as a substance called honeydew. Rycar's Translaminar Activity allows penetration of the waxy leaf cuticle and movement inside the plant leaf. Break, pinch or cut off heavily infested leaves, and immediately place them in a sealed plastic bag for disposal. It has a relatively long-lasting effect. If the bugs look like little white pieces of fluff and stay put when disturbed, then they are mealybugs. When piercing-sucking pests feed on treated leaves, the target pests ingest Rycar and are subject to its affects. If you notice white or brown marks on leaves, you can try to rescue the poinsettia by giving it a shower with very mild soap. In rare cases, poinsettias can get fungal diseases and pests such as mealy bugs. The Mexican mealybug is found commonly on numerous ornamental plants, a few of which are Aralia, chrysanthemum, English ivy, geranium, Gynura, hollyhock, Ixia, lantana, and poinsettia. They are common on African violets, Ficus, jade gardenia, poinsettia and other indoor plants. If your plant develops a gray mold on the soil then water it less frequently and move it to a drier, sunnier location. Mealybugs are white fuzzy things you can see on the stems and leaves. However, one of the easiest to recognize is the mealybug. This treatment method has the greatest impact when most of the whiteflies are clustered on a few leaves. The body of each mealybug is oval and about 1/4 inch long. Mealybugs are the bane of many houseplant owners. These are the largest of the pests and look like blobs of sticky, flat, white cotton about 1/8” long. Test any pesticide on a small, hidden portion of the plant, and monitor that area for injury or unsightly damage for a few days before applying it to the entire poinsettia. Fortunately, poinsettias do not pose any serious risk to pets. The bugs feed by sucking on plant juices. Whereas, in cold climates, mealybugs are less common and seen more in the spring and summer. Mealybugs pierce the plant’s tissue and feed on its sap, which will weaken it – and if the infestation is heavy enough, will eventually kill it. Mealy bugs are a relatively dangerous pest, but easy to see and fairly easy to control. Both indoor and outdoor plants attract mealybugs. Granular insecticides that you add to the soil of infested houseplants may be effective. Angela Ryczkowski is a professional writer who has served as a greenhouse manager and certified wildland firefighter. They look like small white puffs of cotton or fluffy deposits of white powder. This process, sometimes referred to as syringing, is most neatly performed in a sink or outdoors. A very tiny wasp that parasitizes mealybugs is also sometimes used to supplement control by the predators. This provides an enormous benefit when controlling those hard-to-reach pests that feed from the lower leaf surface (abaxial). They vary in size from 1/20 - 1/5 of an inch long. They attach themselves to the plant and secrete a powdery wax layer (hence the name "mealy" bug) used for protection while they suck the plant juices. Houseplants are prone to a varied assortment of insect pest problems. ... jade, poinsettia and cactus. Three hundred or more yellowish or orange eggs may be deposited by a single female. The sweet honeydew excreted by these sap feeders provides a substrate for the distracting black fungus called sooty mold. Alternatively, apply a pesticide that contains imidacloprid to the soil. Biological control is often used to keep mealybug populations at low levels on large houseplants grown in malls and botanical centers. Poinsettias are subject to attack from insect pests and mites all season long, so effective management is a must for quality poinsettia production. In Asia, mango mealybug is considered a major menace for the mango crop. The predators are purchased from the suppliers and released onto infested plants at regular intervals. When I was an interior plantscaper, all the Scheffleras were prone to spider mites, mealy bugs, scale & thrips. A specific ladybug called the mealybug destroyer is particularly effective. (1-5 mm) in length and are covered in a waxy, white coating.Mealybugs tend to hang out in clusters around inaccessible parts of the plant, such as leaf axils, sheaves, between fruits, between twining stems, and some even colonize roots. These mealybugs typically appear powdery and white, as the nymphs are covered by a white waxy material. The mealybugs found on houseplants lay eggs in a compact, white waxy sac, usually in the axils where the leaves join stems. Check at your local county extension offices or online at https://store.extension.iastate.edu/Product/pm1595-pdf. Mealybug infestations appear on plants as tiny, soft-bodied insects surrounded by a fuzzy, white mess around the stems and leaf nodes. © Copyright 2020 Hearst Communications, Inc. Isolating new plants when you first bring them indoors limits the spread of whiteflies and other pests to other houseplants. They can also appear cream or brown-colored. Where Do Mealy Bugs Come From? Controlling Common Pests in Poinsettia Production Pest pressure varies by region in greenhouse poinsettias, but the most common insects include whiteflies, mealybugs, mites and thrips. Weekly repeat applications are usually necessary to achieve control. The filaments grow, curl and tangle until the entire body is covered. Alcohol swabbing and/or insecticidal soap takes care of these nuisances.
2020 mealy bugs on poinsettia