Yucca weevils can only be controlled by keeping the plant in its optimal conditions of dry soil, full sun and good air flow. If you feel the need to control them, you can use the same recommendations as for controlling mealy bugs. Adult root weevils can be controlled with sprays of several kinds of pyrethroid insecticides such as permethrin, bifenthrin, cyfluthrin, or cyhalothrin. These are best applied on the lower trunk of the plants and around the base of the plant to kill the weevils as they climb. East Africa Agricultural and Forestry Journal, 35(3):278-285. This insect bores in and opens the trunk to bacterial infection. The control of the sisal weevil … Snout weevils are beetles about ½ inch (12 mm) in … If one of your Agaves die from weevils, DON’T use its surviving pups in your landscape. The white grub-like larvae tunnel under the bark which can girdle and therefore kill the plant and also tunnel in the tip killing the growing plant. Control of Root Weevils on Plants. In a healthy plant, thrips won't do too much damage. Hopkinson D; Materu MEA, 1970c. Mary and Gary Irish had a good suggestion in their outstanding book, Agave, Yuccas and Related Plants: A Gardeners Guide (2000, Timber Press). Sandy soils should be avoided because they will drain very Eventually, the plant falls over and dies. A similar species also colonizes yuccas. However, we do offer a spray product called BioAdvanced 3 in 1 Insect Disease & Mite Control that will control any type of weevil. In outdoor landscapes, add-ing copious amounts (up to 25%) of pumice will improve drainage and soil structure. The recommended treatment is to remove any yuccas that are infected. Control mealybugs by treating the plant with insecticidal soap. Weevils. Control - Many materials are registered and effective at controlling thrips. ... beetles, weevils, leafhoppers, worms and moths. Plant bugs ( Caulotops and other species) are small insects that occasionally build up in large numbers and damage agave plants by feeding on leaves, resulting in light yellow scars or spots. Control of insect pests in crop plants and stored food grains using plant saponins: A review. Control of agave snout weevil is difficult, and infestations can be prevented by maintaining healthy plants and destroying infested plants. 4) Weevils. BioAdvanced Tree & Shrub Protect & Feed is unfortunately not formulated to control Yucca and/or Agave weevils. Instead, try to locate pups or bulbils from an Agave that successfully flowered and may have had some genetic resistance to weevils and likely passed that Curculionidae, Coleoptera) in sisal in Tanzania. The control of the sisal weevil (Scyphophorus interstitialis Gyll. IV-Field trials with insecticides in bulbil nurseries. 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