The term leaf miners is a catch-all that describes the larvae of three insect species: Lepidoptera, Diptera, and Hymenoptera. Foliar Nematode "Plants are stunted. Featured on: pests begonias. These critters feed at night and love the succulent leaves of begonias and pansies but tend to shy away from shamrock or daisy leaves because they are not as juicy. Fibrous rooted cultivars have small brown leaf spots.Some cultivars exhibit no symptoms despite heavy infection. Also, if the soil goes from wet to dry to wet, this could cause leaf problems, too. Many types of begonia plants are also susceptible to powdery mildew. These tiny, segmented insects measure between 1/20- to 1/5-in. Home âº Forums âº Gardening Discussions âº Flowers & Shrubs âº Holes in my begonia leaves Tagged: begonias This topic contains 5 replies, has 4 voices, and was last updated by HaroldMe 3 years, 1 month ago. (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. Those bugs that eat your plants probably feed birds and frogs. I know, itâs difficult to do, but before adding new plants to your garden or your greenhouse, keep them separate and observe them for a little bit. Place new plants in quarantine for a couple weeks. It MAY be insects, but there are also other possibilities with begonias: Have you gotten your little guy's leaves wet? Some leaf-eating insects can cause so much damage in just a few days that your plants might be dead within the week! Prevention is critical, as whiteflies aren't well controlled with pesticides. If this 'maggot' is small, hasa reddish brown head and is curled up in the form of a letter 'c' then it is a vine weevil grub and will eat the roots of your begonias. Viewing 6 posts - 1 through 6 (of 6 total) Author Posts 25th July 2016 at 10:59 am #9420â¦ Begonias sometimes host giant whiteflies, which are flying pests that leave a waxy deposit on the leaves. Bulbaholic . Remove dead and dying flowers and leaves. Whiteflies. Like leafhoppers, plant bugs inject a toxin into your plantsâ leaves, buds, and shoots as they feed. Apply a fungicide to protect plants. Try to keep the soil evenly wet (not soggy). Beyond curling, gardeners will then begin to notice distinctive white patches on the leaves of the plant. "Plant bugs" is a term that includes a number of true bugs, members of the Hemiptera order of insects. Thrips, for example, are among the most common begonia pests which may cause leaves to curl. In most cases, insects feed for a few weeks on plants and then move on. Begonia leaf curl is often among the first symptoms. Use our quick guide to identify the pest eating your plant and what solution would be best to keep that bug away from destroying your garden. The most common plant bugs of interest to gardeners are cinch bugs, harlequin bugs, and squash bugs. If you own a greenhouse, those white dots on your plants could well be mealybugs. Bronzed or water-soaked areas develop on leaves of some cultivars. When watering, try not to do this - begonias are fussy and do not like wet leaves. Excessive red pigment develops in infected leaves. Basically, leaf miners are the larval â or maggot â stage of several insect â¦ These larvae live inside plant leaves, feeding and growing until they reach maturity. Answers. If you don't see insect pests, I wonder if slugs or snails are busy eating the leaves after dusk? Go out at night with a flashlight to see if you can find these critters. That way, if you develop problems with hidden pests, youâll be able to deal with them fast. What Are Leaf miners?