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 Cribrate and citrus weevils feed on foliage and bark, causing leaf drop, fruit drop, stunted growth, loss of leaves, twig dieback, reduced fruit yield and water stress. Leafhoppers fed with 1% Yucca saponin or 5% crude-saponin of alfalfa died within 2–3 days due to toxic effects and non-preference of the diet containing saponins. Agave Borer Weevil, (also known as the Agave Snout Weevil) and the Yucca weevil are devastating insect pests to members of the Agave and Yucca genera. The Yucca Weevil. Seed weevil damage. More recently, we have found introduced agave or yucca weevils to UNF. Secondary infections by various pathogen often result from feeding damage. Damage by the `Yucca Weevil', Scyphophrus acupunctatus, is most extensive in the cane. The very large Agave americana or century plant is more susceptible to weevil damage than the smaller species. Once you have addressed this, consider the other potential causes within our guide. and other members of the genus Yucca in the southwestern region of the United States and Baja California (Waring 1986). the monophagous yucca weevil, which feeds on Yucca whipplei Torr. Weevils as Biocontrol Agents ... •Unknown species? If your agave has flopped over and you see an abundance of adult weevils at the base it is of course too late. Because of the damage from these insects, we have stopped planting Yucca filamentosa in large groups on campus. •Control is difficult •Once damage is apparent, control is impossible. otherwise that I feel the use of pesticides are appropriate. Mary and Gary Irish had a good suggestion in their outstanding book, Agave, Yuccas and Related Plants: A Gardeners Guide (2000, Timber Press). Snout weevils are probably the most damaging pests to agaves and yuccas. If you grow eastern arborescent yucca such as aloifolia keep in mind that they are a suitable host for these things as well. It this instance though the larvae start in the bud and burrow well down into the trunk before causing collapse. The yucca simply does not need a lot of water and should be properly drained of moisture to thrive. The adult weevil attacks many species of agave. While checking the crevice garden for more yucca damage I noticed Agave 'Blue Glow' had telltale signs of yellowing bottom leaves. 16). If one of your Agaves die from weevils, DON’T use its surviving pups in your landscape. In outdoor landscapes, add-ing copious amounts (up to 25%) of pumice will improve drainage and soil structure. Either I have both types or they are indiscriminate. Agaves and Yuccas are generally slow- One such pest is the Agave Borer Weevil and its close cousin the Yucca Weevil. 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. Damage. The agave snout weevil ( Scyphophorus acupunctatus ), also known as the sisal weevil, feeds on many species of agave and can be especially damaging to the larger species such as century plant ( Agave americana ) and blue agave ( Agave tequilana ). They are much more destructive than the skippers. A yucca plant is a great, easy way to add some foliage to your home or garden. Even though most websites ID the Agave weevil as different from the Yucca weevil, there seems to be no difference in the damage. Agave Snout Weevil (Scyphophorus acupunctatus) ... damage occurs on Y. aloifolia, Y. gloriosa, and Y. recurvifolia, es- ... and yucca successfully in heavy clay soils. Agave Snout Weevil (Scyphophorus acupunctatus). 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