What are the control methods for the banana moth on Dracaena fragrans?
Morphological characteristics. The adult is yellowish brown; the forewings are dark brown with 1 black spot each in the discal cell and on the posterior margin; the hindwings are yellowish brown with long hairs on the posterior margin; the eggs are pale yellow and round; the larvae are about 30 mm long with a reddish-brown head, rows of rectangular spots on the back, and hair tufts on the sides of the body; the pupae are brown.
Life habits. In Guangdong and other places, about 5 to 6 generations occur per year, while in northern regions 3 to 4 generations occur per year. It overwinters as larvae in the potting soil of potted flowers in large shade houses and greenhouses. When temperature and humidity are suitable the following year, the larvae crawl onto the ornamental plants to feed, generally boring into the cortex, sometimes also boring into the surface of the xylem, and a few larvae bore into the pith through wounds, hollowing out the plant. The larvae have about 7 instars, and the larval stage lasts more than 1 month. Mature larvae mostly pupate in the upper part of the wooden cane in summer and in the soil in autumn; the pupal stage is about 15 days. Adults have the habit of supplemental feeding. Eggs are laid singly or in clusters; the egg stage is about 4 days. Newly hatched larvae spin silk and hang down, then bore into the cortex to cause damage, with Dracaena fragrans canes more than 3 years old suffering the most severe damage. Control methods
① Strengthen quarantine. The harmfulness of this pest must be recognized, quarantine management of ornamental plant exchange and transport must be strengthened, the spread of Dracaena fragrans canes carrying the pest must be strictly prohibited, and infested canes should be burned promptly when found.
② Eliminate the source of the pest. Soil replacement for potted Dracaena fragrans in large shade houses and greenhouses must be strengthened; overwintering larvae and pupae found in the potting soil should be eliminated promptly by spraying to prevent their reproduction and development.
③ Chemical control. Grasp the hatching period of each generation's eggs and spray 1 to 2 times during that period; you can spray the stems with 20% quinalphos emulsifiable concentrate at 1500 times, or 50% fenitrothion emulsifiable concentrate at 1000 times. If damage is found in summer, spray promptly for control. From autumn and winter until before early spring, use 20% quinalphos emulsifiable concentrate at 1500 times, 50% phoxim emulsifiable concentrate at 1000 times, 50% fenitrothion emulsifiable concentrate at 1000 times, 80% dichlorvos emulsifiable concentrate at 1000 times, 80% trichlorfon at 800 times, or 40% omethoate emulsifiable concentrate at 1000 times, spraying once every 7 days and continuously spraying the stems 2 to 3 times; or pour 75% phoxim emulsifiable concentrate at 1500 times or 40% isofenphos-methyl emulsifiable concentrate at 1000 times into the pot; you can also mix 50% carbaryl powder at 1:200 with soil and spread it in the surface soil of the flowerpot once every 15 days for 2 to 3 consecutive applications, which can kill the overwintering larvae.
Control of the banana moth on Dracaena fragrans
The banana moth (Opogona sacchari) is a quarantine lepidopteran pest worldwide. It occurs in all southern provinces and autonomous regions, and in recent years has spread rapidly northward. According to surveys, in addition to damaging Dracaena fragrans (the "Brazilian iron" cane), the banana moth also attacks more than 50 species of ornamental plants and economic crops, including Pachira aquatica (money tree), poinsettia, sago palm, Chamaedorea elegans, Hainan Dracaena, Dracaena draco, Rhapis excelsa, Calathea, pineapple, lily, Strelitzia, Schefflera, sugarcane, banana and pineapple. The banana moth is a stem-boring pest that ordinary pesticide sprays cannot kill, and control is difficult; therefore this pest spreads relatively quickly and has become one of the main destructive pests in ornamental plant production. The banana moth larvae bore into and feed on the epidermis of Dracaena fragrans, completely destroying the vascular tissue; in the damaged area only a thin outer epidermis and the xylem remain, and the bark separates very easily from the xylem. Mild symptoms are hard to notice, but in severe cases they hinder the normal growth and development of the plant, causing the cane segments to dry up, fail to sprout, and even the whole plant to die, completely losing its ornamental value.Morphological characteristics
The adult is yellowish brown; the forewings are dark brown with 1 black spot each in the discal cell and on the posterior margin; the hindwings are yellowish brown with long hairs on the posterior margin; the eggs are pale yellow and round; the larvae are about 30 mm long with a reddish-brown head, rows of rectangular spots on the back, and hair tufts on the sides of the body; the pupae are brown.
Life habits
In Guangdong and other places, about 5 to 6 generations occur per year, while in northern regions 3 to 4 generations occur per year. It overwinters as larvae in the potting soil of potted flowers in large shade houses and greenhouses. When temperature and humidity are suitable the following year, the larvae crawl onto the ornamental plants to feed, generally boring into the cortex, sometimes also boring into the surface of the xylem, and a few larvae bore into the pith through wounds, hollowing out the plant. The larvae have about 7 instars, and the larval stage lasts more than 1 month. Mature larvae mostly pupate in the upper part of the wooden cane in summer and in the soil in autumn; the pupal stage is about 15 days. Adults have the habit of supplemental feeding. Eggs are laid singly or in clusters; the egg stage is about 4 days. Newly hatched larvae spin silk and hang down, then bore into the cortex to cause damage, with Dracaena fragrans canes more than 3 years old suffering the most severe damage. http://www.yuhuagu.com
Control methods
① Strengthen quarantine. The harmfulness of this pest must be recognized, quarantine management of ornamental plant exchange and transport must be strengthened, the spread of Dracaena fragrans canes carrying the pest must be strictly prohibited, and infested canes should be burned promptly when found.
② Eliminate the source of the pest. Soil replacement for potted Dracaena fragrans in large shade houses and greenhouses must be strengthened; overwintering larvae and pupae found in the potting soil should be eliminated promptly by spraying to prevent their reproduction and development.
③ Chemical control. Grasp the hatching period of each generation's eggs and spray 1 to 2 times during that period; you can spray the stems with 20% quinalphos emulsifiable concentrate at 1500 times, or 50% fenitrothion emulsifiable concentrate at 1000 times. If damage is found in summer, spray promptly for control. From autumn and winter until before early spring, use 20% quinalphos emulsifiable concentrate at 1500 times, 50% phoxim emulsifiable concentrate at 1000 times, 50% fenitrothion emulsifiable concentrate at 1000 times, 80% dichlorvos emulsifiable concentrate at 1000 times, 80% trichlorfon at 800 times, or 40% omethoate emulsifiable concentrate at 1000 times, spraying once every 7 days and continuously spraying the stems 2 to 3 times; or pour 75% phoxim emulsifiable concentrate at 1500 times or 40% isofenphos-methyl emulsifiable concentrate at 1000 times into the pot; you can also mix 50% carbaryl powder at 1:200 with soil and spread it in the surface soil of the flowerpot once every 15 days for 2 to 3 consecutive applications, which can kill the overwintering larvae.
Control methods for the banana moth on Dracaena fragrans
The banana moth (Opogona sacchari) is a dangerous quarantine lepidopteran pest worldwide. It occurs in all southern provinces and autonomous regions, and in recent years has spread rapidly northward. According to surveys, in addition to damaging Dracaena fragrans (the "Brazilian iron" cane), the banana moth also attacks more than 50 species of ornamental plants and economic crops, including Pachira aquatica (money tree), poinsettia, sago palm, Chamaedorea elegans, Hainan Dracaena, Dracaena draco, Rhapis excelsa, Calathea, pineapple, lily, Strelitzia, Schefflera, sugarcane, banana and pineapple. The banana moth is a stem-boring pest that ordinary pesticide sprays cannot kill, and control is difficult; therefore this pest spreads relatively quickly and has become one of the main destructive pests in ornamental plant production. The banana moth larvae bore into and feed on the epidermis of Dracaena fragrans, completely destroying the vascular tissue; in the damaged area only a thin outer epidermis and the xylem remain, and the bark separates very easily from the xylem. Mild symptoms are hard to notice, but in severe cases they hinder the normal growth and development of the plant, causing the cane segments to dry up, fail to sprout, and even the whole plant to die, completely losing its ornamental value.
1. Morphological characteristics:The adult is about 9 mm, yellowish brown; the forewings are dark brown with 1 black spot each in the discal cell and on the posterior margin; the hindwings are yellowish brown with long hairs on the posterior margin; the eggs are pale yellow and oval; the larvae are about 30 mm long with a reddish-brown head, rows of rectangular spots on the back, and hair tufts on the sides of the body; the pupae are brown.
2. Life habits:In South China, including Guangdong and other places, about 5-6 generations occur per year, while in northern regions 3-4 generations occur per year. It overwinters as larvae in the potting soil of potted flowers in large shade houses and greenhouses. When temperature and humidity are suitable the following year, the larvae crawl onto the ornamental plants to feed, boring relatively quickly up and down and side to side within the cortex, sometimes also boring into the surface of the xylem, and a few larvae bore into the pith of the cane segments through wounds, hollowing them out. The larvae have about 7 instars, and the larval stage lasts more than 1 month. Mature larvae mostly pupate in the upper part of the wooden cane in summer and in the soil in autumn; the pupal stage is about 15 days. Adults have the habit of supplemental feeding. Eggs are laid singly or in clusters; the egg stage is about 4 days. Newly hatched larvae spin silk and hang down, then bore into the cortex of the canes to cause damage, with Dracaena fragrans canes more than 3 years old suffering severe damage.
3. Control methods:
① Strengthen quarantine. The harmfulness of this pest must be recognized, quarantine management of ornamental plant exchange and transport must be strengthened, the spread of Dracaena fragrans canes carrying the pest must be strictly prohibited, and infested canes should be burned promptly when found.
② Eliminate the source of the pest. Soil replacement for potted Dracaena fragrans in large shade houses and greenhouses must be strengthened; overwintering larvae and pupae found in the potting soil should be eliminated promptly by spraying to prevent reproduction and development.
③ Chemical control. Grasp the hatching period of each generation's eggs and spray 1-2 times; you can spray the stems with 20% quinalphos emulsifiable concentrate at 1500 times, or 50% fenitrothion emulsifiable concentrate at 1000 times. If damage is found in summer, spray promptly for control; especially from autumn and winter until before early spring, use 20% quinalphos emulsifiable concentrate at 1500 times, 50% phoxim emulsifiable concentrate at 1000 times, 50% fenitrothion emulsifiable concentrate at 1000 times, 80% dichlorvos emulsifiable concentrate at 1000 times, 80% trichlorfon at 8000 times, or 40% omethoate emulsifiable concentrate at 1000 times, spraying once every 7 days and continuously spraying the stems 2-3 times. Or pour 75% phoxim emulsifiable concentrate at 1500 times or 40% isofenphos-methyl emulsifiable concentrate at 1000 times into the pot; you can also mix 50% carbaryl powder at 1:200 with soil and spread it in the surface soil of the flowerpot once every 15 days for 2-3 consecutive applications, which can kill the overwintering larvae.