Insect pests of gladiolus and lily plants.
The arthropod pests attacking the bulbs and roots and the above-ground parts of Gladiolus and lily plants are discussed. Among the pests that damage leaves of Gladiolus plants are tetranychids, thrips, aphids, Spodoptera litura, S. exigua, Agrotis ipsilon, Entpoasca formosana [Empoasca formosana], Euproctis taiwana, Orgyia postica, and adult scarabaeids. Pests damaging underground parts of Gladiolus plants include Rhizoglyphus robini, R. setosus, cutworms, scarabaeid larvae, Collembola and thrips, while aphids damage flowers. Fewer pests occur on lily plants, with R. robini and R. setosus and Aphis gossypii being the most important. Information regarding control of arthropod pests on Gladiolus and lily plants is very limited. Insecticides are recommended for controlling thrips and Rhizoglyphus spp.: profenofos 43% EC, methomyl 90% WP and imidacloprid 9.6% S. Thrips can be controlled with carbosulfan 40% WP, abamectin 2% EC, bifenthrin 2.8% EC, fenpropathrin 10% EC or propargite 57% EC. Propargite can also be used for tetranychid control. Integrated pest control is recommended for the control of bulb mites. Alternate cropping with rice, solar drying of soils, planting and ploughing-in of Sesbania, long-term submergence of soil in water, and chemical or warm-water treatment of the bulbs are recommended. When needed, soil treatment with insecticides can be used 21 days after planting. It is more efficient to spread granular insecticides during planting.