Control Methods and Technical Key Points for the Flamboyant Tree Owlet Moth Pest
Flamboyant tree (image from the internet)
The flamboyant tree (Delonix regia) is known as one of the most brilliantly colored trees in the world; its name comes from its bright red or orange flowers combined with bright green bipinnate compound leaves, and it is commonly planted in Guangdong, Fujian, Sichuan and other places. The flamboyant tree has relatively few diseases and pests, but owlet moth pests are relatively common. The control measures for the flamboyant tree owlet moth pest are described below for reference.
1. Morphological characteristics
Adult: body length 17-22mm, wingspan 33-48mm. Head and thorax grayish brown, collar with 2 brown transverse lines. Abdomen grayish brown, with a black hair tuft on the back of each of the third, fourth and fifth segments.
Egg: green, slightly hemispherical, the bottom adhering to the leaf surface, the eggshell surface with about 40 longitudinal ridges.
Larva: mature larva body length 44-60mm, width about 4mm. The back of the body has a layer of white powder, some showing red spiracular upper lines, and the parts between abdominal segments are brownish yellow. Behind the spiracles of the first to eighth abdominal segments there is a slightly raised dark brown irregular patch.
Pupa: length 17-26mm, dark brown, light blackish brown near eclosion. The anal spine is relatively long, with 2 pairs of brown hooks curving to the sides at the end, and on each side of these there is 1 short hook curving inward.
2. Occurrence pattern
The flamboyant tree owlet moth has 8-9 generations per year in Hainan. During the day it hides in dark places relatively high above the ground; when resting, its wings are spread flat against the resting surface. Adults have strong phototaxis. In the early stage of an outbreak, eggs are concentrated on the upper part of the canopy, forest edges and high-lying woodland, mostly scattered on the underside of leaves, with 870-1270 eggs per female. From 4 to 8 o'clock is the peak hatching period for larvae, and newly hatched larvae feed on the eggshell.
When the leaves are nearly eaten up, they have the habit of gathering and moving in groups. After being disturbed, larvae crawl quickly or drop by spinning silk, and final-instar larvae also bounce and fall to the ground; when resting they arch into a bridge shape, and after molting they can consume the old exuviae completely. Mature larvae pupate on the host tree, or crawl onto other trees and weeds to tie leaves together and form cocoons. Continuous high temperature and drought from May to June often cause outbreaks of this insect.
3. Control methods
Forestry control: For the flamboyant tree owlet moth, strip mixed afforestation can be used when planting in large contiguous stands; graft in time, and carefully carry out post-grafting management such as loosening the ties and removing the front, so as to suppress the increase and decrease of this pest.
Manual control: Manually crush the larvae of the owlet moth in the nursery. Light trapping: Most adult insects of the family Noctuidae have phototaxis and can be trapped and killed with light.
Biological control: Protect and utilize natural enemies, such as ants, ladybugs, hornets, wasps, tachinid flies, green lacewings, beneficial birds, bats and other natural enemies in nurseries and woodland, all of which must be protected and utilized.
Chemical control:
(1) For young larvae, spray 50% fenitrothion emulsifiable concentrate at 1000 times dilution, or 50% dichlorvos emulsifiable concentrate at 1000-1500 times dilution, or 40% dimethoate emulsifiable concentrate, or malathion emulsifiable concentrate at 800-1000 times dilution, or 75% phoxim emulsifiable concentrate, or 50% parathion emulsifiable concentrate at 2000 times dilution, or Guan% dibaiyou crystals at 1000-1500 times dilution, or 40% isocarbophos emulsifiable concentrate, or 50% methamidophos emulsifiable concentrate at 500-1000 times dilution, or 25% carbaryl wettable powder at 1500 times dilution, or 2.5% deltamethrin, or 20% fenvalerate emulsifiable concentrate at 3000-5000 times dilution, or 10% cypermethrin emulsifiable concentrate, using 150-300ml per hectare, or diflubenzuron No. 3 20% gel suspension at 2000-3000 times dilution.
(2) For larvae that have bored into the shoot tips, use 50% monocrotophos emulsifiable concentrate, or 40% omethoate emulsifiable concentrate at 10 times dilution for trunk injection, or use 50% fenitrothion emulsifiable concentrate, or 50% naled emulsifiable concentrate at 30-40 times dilution to smear the damaged area.
Control of the Flamboyant Tree Owlet Moth Pest
Flamboyant tree (image from the internet)
China Landscape Network news, December 2: The flamboyant tree (Delonix regia) is known as one of the most brilliantly colored trees in the world; its name comes from its bright red or orange flowers combined with bright green bipinnate compound leaves, and it is commonly planted in Guangdong, Fujian, Sichuan and other places. The flamboyant tree has relatively few diseases and pests, but owlet moth pests are relatively common. The control measures for the flamboyant tree owlet moth pest are described below for reference.
1. Morphological characteristics
Adult: body length 17-22mm, wingspan 33-48mm. Head and thorax grayish brown, collar with 2 brown transverse lines. Abdomen grayish brown, with a black hair tuft on the back of each of the third, fourth and fifth segments.
Egg: green, slightly hemispherical, the bottom adhering to the leaf surface, the eggshell surface with about 40 longitudinal ridges.
Larva: mature larva body length 44-60mm, width about 4mm. The back of the body has a layer of white powder, some showing red spiracular upper lines, and the parts between abdominal segments are brownish yellow. Behind the spiracles of the first to eighth abdominal segments there is a slightly raised dark brown irregular patch.
Pupa: length 17-26mm, dark brown, light blackish brown near eclosion. The anal spine is relatively long, with 2 pairs of brown hooks curving to the sides at the end, and on each side of these there is 1 short hook curving inward.
2. Occurrence pattern
The flamboyant tree owlet moth has 8-9 generations per year in Hainan. During the day it hides in dark places relatively high above the ground; when resting, its wings are spread flat against the resting surface. Adults have strong phototaxis. In the early stage of an outbreak, eggs are concentrated on the upper part of the canopy, forest edges and high-lying woodland, mostly scattered on the underside of leaves, with 870-1270 eggs per female. From 4-8 o'clock is the peak hatching period for larvae, and newly hatched larvae feed on the eggshell.
When the leaves are nearly eaten up, they have the habit of gathering and moving in groups. After being disturbed, larvae crawl quickly or drop by spinning silk, and final-instar larvae also bounce and fall to the ground; when resting they arch into a bridge shape, and after molting they can consume the old exuviae completely. Mature larvae pupate on the host tree, or crawl onto other trees and weeds to tie leaves together and form cocoons. Continuous high temperature and drought from May to June often cause outbreaks of this insect.
3. Control methods
Forestry control: For the flamboyant tree owlet moth, strip mixed afforestation can be used when planting in large contiguous stands; graft in time, and carefully carry out post-grafting management such as loosening the ties and removing the front, so as to suppress the increase and decrease of this pest.
Manual control: Manually crush the larvae of the owlet moth in the nursery. Light trapping: Most adult insects of the family Noctuidae have phototaxis and can be trapped and killed with light.
Biological control: Protect and utilize natural enemies, such as ants, ladybugs, hornets, wasps, tachinid flies, green lacewings, beneficial birds, bats and other natural enemies in nurseries and woodland, all of which must be protected and utilized.
Chemical control:
(1) For young larvae, spray 50% fenitrothion emulsifiable concentrate at 1000 times dilution, or 50% dichlorvos emulsifiable concentrate at 1000-1500 times dilution, or 40% dimethoate emulsifiable concentrate, or malathion emulsifiable concentrate at 800-**** times dilution, or 75% phoxim emulsifiable concentrate, or 50% parathion emulsifiable concentrate at 2000 times dilution, or Guan% dibaiyou crystals at 1000-1500 times dilution, or 40% isocarbophos emulsifiable concentrate, or 50% methamidophos emulsifiable concentrate at 500-1000 times dilution, or 25% carbaryl wettable powder at 1500 times dilution, or 2.5% deltamethrin, or 20% fenvalerate emulsifiable concentrate at 3000-5000 times dilution, or 10% cypermethrin emulsifiable concentrate, using 150-300ml per hectare, or diflubenzuron No. 3 20% gel suspension at 2000-3000 times dilution.
(2) For larvae that have bored into the shoot tips, use 50% monocrotophos emulsifiable concentrate, or 40% omethoate emulsifiable concentrate at 10 times dilution for trunk injection, or use 50% fenitrothion emulsifiable concentrate, or 50% naled emulsifiable concentrate at 30-40 times dilution to smear the damaged area.
Control Methods for the Flamboyant Tree Owlet Moth Pest
The flamboyant tree (Delonix regia) is known as one of the most brilliantly colored trees in the world; its name comes from its bright red or orange flowers combined with bright green bipinnate compound leaves, and it is commonly planted in Guangdong, Fujian, Sichuan and other places. The flamboyant tree has relatively few diseases and pests, but owlet moth pests are relatively common. The control measures for the flamboyant tree owlet moth pest are described below for reference.
1. Morphological characteristics
Adult: body length 17-22mm, wingspan 33-48mm. Head and thorax grayish brown, collar with 2 brown transverse lines. Abdomen grayish brown, with a black hair tuft on the back of each of the third, fourth and fifth segments.
Egg: green, slightly hemispherical, the bottom adhering to the leaf surface, the eggshell surface with about 40 longitudinal ridges.
Larva: mature larva body length 44-60mm, width about 4mm. The back of the body has a layer of white powder, some showing red spiracular upper lines, and the parts between abdominal segments are brownish yellow. Behind the spiracles of the first to eighth abdominal segments there is a slightly raised dark brown irregular patch.
Pupa: length 17-26mm, dark brown, light blackish brown near eclosion. The anal spine is relatively long, with 2 pairs of brown hooks curving to the sides at the end, and on each side of these there is 1 short hook curving inward.
2. Occurrence pattern
The flamboyant tree owlet moth has 8-9 generations per year in Hainan. During the day it hides in dark places relatively high above the ground; when resting, its wings are spread flat against the resting surface. Adults have strong phototaxis. In the early stage of an outbreak, eggs are concentrated on the upper part of the canopy, forest edges and high-lying woodland, mostly scattered on the underside of leaves, with 870-1270 eggs per female. From 4—8 o'clock is the peak hatching period for larvae, and newly hatched larvae feed on the eggshell.
When the leaves are nearly eaten up, they have the habit of gathering and moving in groups. After being disturbed, larvae crawl quickly or drop by spinning silk, and final-instar larvae also bounce and fall to the ground; when resting they arch into a bridge shape, and after molting they can consume the old exuviae completely. Mature larvae pupate on the host tree, or crawl onto other trees and weeds to tie leaves together and form cocoons. Continuous high temperature and drought from May to June often cause outbreaks of this insect.
3. Control methods
Forestry control: For the flamboyant tree owlet moth, strip mixed afforestation can be used when planting in large contiguous stands; graft in time, and carefully carry out post-grafting management such as loosening the ties and removing the front, so as to suppress the increase and decrease of this pest.
Manual control: Manually crush the larvae of the owlet moth in the nursery. Light trapping: Most adult insects of the family Noctuidae have phototaxis and can be trapped and killed with light.
Biological control: Protect and utilize natural enemies, such as ants, ladybugs, hornets, wasps, tachinid flies, green lacewings, beneficial birds, bats and other natural enemies in nurseries and woodland, all of which must be protected and utilized.
Chemical control:
(1) For young larvae, spray 50% fenitrothion emulsifiable concentrate at 1000 times dilution, or 50% dichlorvos emulsifiable concentrate at 1000-1500 times dilution, or 40% dimethoate emulsifiable concentrate, or malathion emulsifiable concentrate at 800-**** times dilution, or 75% phoxim emulsifiable concentrate, or 50% parathion emulsifiable concentrate at 2000 times dilution, or Guan% dibaiyou crystals at 1000-1500 times dilution, or 40% isocarbophos emulsifiable concentrate, or 50% methamidophos emulsifiable concentrate at 500-1000 times dilution, or 25% carbaryl wettable powder at 1500 times dilution, or 2.5% deltamethrin, or 20% fenvalerate emulsifiable concentrate at 3000-5000 times dilution, or 10% cypermethrin emulsifiable concentrate, using 150-300ml per hectare, or diflubenzuron No. 3 20% gel suspension at 2000-3000 times dilution.
(2) For larvae that have bored into the shoot tips, use 50% monocrotophos emulsifiable concentrate, or 40% omethoate emulsifiable concentrate at 10 times dilution for trunk injection, or use 50% fenitrothion emulsifiable concentrate, or 50% naled emulsifiable concentrate at 30-40 times dilution to smear the damaged area.