Pest control of Plutella xylostella

Phoenix wood (picture from the Internet)

Phoenix wood is known as one of the most colorful trees in the world. Its name comes from bright red or orange flowers with bright green pinnately compound leaves. It is often planted in Guangdong, Fujian, Sichuan and other places. The diseases and insect pests of Phoenix wood are less, but the night moth pests are more common. The pest control measures of Spodoptera litura are introduced as follows, which can be used for reference.

1. Morphological characteristics.

Adult: body length 17-22mm, wingspan 33-48mm. The head and chest are grayish brown, and the neck plate has 2 brown horizontal lines. The abdomen is grayish brown, and there is a black hair cluster on the back of the third, fourth and fifth segments.

Eggs: green, slightly hemispherical, the bottom adheres to the leaves, and there are about 40 longitudinal ridges on the surface of the eggshell.

Larvae: the old larvae are 44-60mm in length and about 4mm in width. There is a layer of white powder on the back of the body, and some reflect that the upper line of the red valve is brown in the part of the ventral internodes. There is a slightly raised black-brown irregular plaque behind the first to eighth valve in the abdomen.

Pupae: long 17-26mm, dark brown, light dark brown when near Eclosion. The gluteal spine is longer, and there are two pairs of brown hooks bent to both sides at the end, and one short hook bent to the inside on each side.

2. Occurrence regularity

Phoenix Muyue occurs in Hainan for 8-9 generations a year, lurking in the shade high above the ground during the day, spreading its wings at rest and sticking flat on the resting object. The adults have strong phototaxis, and the eggs are concentrated in the upper part of the crown, the edge of the forest and the woodland with high topography in the early stage of large occurrence, and most of them are scattered on the back of leaves, and the number of eggs per female is 870-1270. The peak period of larval hatching is from 4 to 8 o'clock, and the newly hatched larvae feed on the egg shell.

When the leaves are about to be eaten up, there is a habit of cluster transfer. The larvae crawl or droop quickly after being frightened, and the last instar larvae will bounce to the ground and arch into a bridge shape when they perch, and can eat all the old molts after peeling. Mature larvae pupate on host trees or climb other trees and weeds. The continuous high temperature and drought weather from May to June often causes the occurrence of the pest.

3. Prevention and control methods

Forestry control: banded mixed afforestation can be used for Phoenix wood night moth afforestation, timely grafting, seriously do a good job of management and protection after grafting, such as unbinding, except before, in order to restrain the reproduction and reduction of this pest.

Artificial control: the larvae with nocturnal moth were artificially killed in the nursery. Light traps and kills adults of Noctuidae mostly have phototaxis and can be trapped and killed by light.

Biological control: protection and utilization of natural enemies, such as ants, ladybugs, wasps, wasps, flies, lacewings, beneficial birds, weaving and other natural enemies in nurseries and woodlands.

Chemical control:

(1) spraying 1000 times of 50% fenitrothion EC, or 1000-1500 times of 50% dichlorvos EC, or 80-1000 times of dimethoate or malathion EC, or 2000 times of phoxim EC or 50% parathion EC, or 1000-1500 times of isocarbophos or methamidophos emulsion, or 1500 times of carbaryl. Or 2.5% cypermethrin, or 20% cypermethrin EC 3000-5000 times, or 10% cypermethrin EC, 150-300ml per hectare, or Miaozang 3 20% gel suspension 2000-3000 times.

(2) the larvae in the eaten shoots can be dried with 50% monocrotophos EC or 40% omethoate EC, or smeared with 50% fenitrothion EC or 50% dibromophos EC with a 40-fold solution.

Pest control of Plutella xylostella

Phoenix wood (picture from the Internet)

China Garden Network, Dec. 2: Phoenix wood is known as one of the most colorful trees in the world. Its name comes from bright red or orange flowers with bright green pinnately compound leaves. It is often planted in Guangdong, Fujian, Sichuan and other places. There are few diseases and insect pests in Phoenix wood, but night moth pests are more common. The pest control measures of Spodoptera litura are introduced as follows, which can be used for reference.

1. Morphological characteristics.

Adult: body length 17-22mm, wingspan 33-48mm. The head and chest are grayish brown, and the neck plate has 2 brown horizontal lines. The abdomen is grayish brown, and there is a black hair cluster on the back of the third, fourth and fifth segments.

Eggs: green, slightly hemispherical, the bottom adheres to the leaves, and there are about 40 longitudinal ridges on the surface of the eggshell.

Larvae: the old larvae are 44-60mm in length and about 4mm in width. There is a layer of white powder on the back of the body, and some reflect that the upper line of the red valve is brown in the part of the ventral internodes. There is a slightly raised black-brown irregular plaque behind the first to eighth valve in the abdomen.

Pupae: long 17-26mm, dark brown, light dark brown when near Eclosion. The gluteal spine is longer, and there are two pairs of brown hooks bent to both sides at the end, and one short hook bent to the inside on each side.

2. Occurrence regularity

Phoenix Muyue occurs in Hainan for 8-9 generations a year, lurking in the shade high above the ground during the day, spreading its wings at rest and sticking flat on the resting object. The adults have strong phototaxis, and the eggs are concentrated in the upper part of the crown, the edge of the forest and the woodland with high topography in the early stage of large occurrence, and most of them are scattered on the back of leaves, and the number of eggs per female is 870-1270. The peak period of larval hatching is from 4 to 8 o'clock, and the newly hatched larvae feed on the egg shell.

When the leaves are about to be eaten up, there is a habit of cluster transfer. The larvae crawl or droop quickly after being frightened, and the last instar larvae will bounce to the ground and arch into a bridge shape when they perch, and can eat all the old molts after peeling. Mature larvae pupate on host trees or climb other trees and weeds. The continuous high temperature and drought weather from May to June often causes the occurrence of the pest.

3. Prevention and control methods

Forestry control: banded mixed afforestation can be used for Phoenix wood night moth afforestation, timely grafting, seriously do a good job of management and protection after grafting, such as unbinding, except before, in order to restrain the reproduction and reduction of this pest.

Artificial control: the larvae with nocturnal moth were artificially killed in the nursery. Light traps and kills adults of Noctuidae mostly have phototaxis and can be trapped and killed by light.

Biological control: protection and utilization of natural enemies, such as ants, ladybugs, wasps, wasps, flies, lacewings, beneficial birds, weaving and other natural enemies in nurseries and woodlands.

Chemical control:

(1) spray 1000 times of 50% fenitrothion EC, or 1000-1500 times of 50% dichlorvos EC, or 50% dimethoate EC, or malathion EC 800 times, or 2000 times of phoxim EC, or 50% parathion EC, or 1000-1500 times of dimethophos crystals, or 50% isocarbophos emulsion, or 50% methamidophos emulsion. Or 1500-fold solution of 25% carbaryl wettable agent, or 2.5% cypermethrin, or 20% cypermethrin EC 3000-5000 times, or 10% cypermethrin EC 2000-3000 times per hectare, or 2000-3000 times of 20% gel suspension of Miaozang 3.

(2) the larvae in the eaten shoots can be dried with 50% monocrotophos EC or 40% omethoate EC, or smeared with 50% fenitrothion EC or 50% dibromophos EC with a 40-fold solution.

Control methods of insect pests of Spodoptera litura

Phoenix wood is known as one of the most colorful trees in the world. Its name comes from bright red or orange flowers with bright green pinnately compound leaves. It is often planted in Guangdong, Fujian, Sichuan and other places. The diseases and insect pests of Phoenix wood are less, but the night moth pests are more common. The pest control measures of Spodoptera litura are introduced as follows, which can be used for reference.

1. Morphological characteristics.

Adult: body length 17-22mm, wingspan 33-48mm. The head and chest are grayish brown, and the neck plate has 2 brown horizontal lines. The abdomen is grayish brown, and there is a black hair cluster on the back of the third, fourth and fifth segments.

Eggs: green, slightly hemispherical, the bottom adheres to the leaves, and there are about 40 longitudinal ridges on the surface of the eggshell.

Larvae: the old larvae are 44-60mm in length and about 4mm in width. There is a layer of white powder on the back of the body, and some reflect that the upper line of the red valve is brown in the part of the ventral internodes. There is a slightly raised black-brown irregular plaque behind the first to eighth valve in the abdomen.

Pupae: long 17-26mm, dark brown, light dark brown when near Eclosion. The gluteal spine is longer, and there are two pairs of brown hooks bent to both sides at the end, and one short hook bent to the inside on each side.

2. Occurrence regularity

Phoenix Muyue occurs in Hainan for 8-9 generations a year, lurking in the shade high above the ground during the day, spreading its wings at rest and sticking flat on the resting object. The adults have strong phototaxis, and the eggs are concentrated in the upper part of the crown, the edge of the forest and the woodland with high topography in the early stage of large occurrence, and most of them are scattered on the back of leaves, and the number of eggs per female is 870-1270. The peak period of larval hatching is from 4 to 8 o'clock, and the newly hatched larvae feed on the egg shell.

When the leaves are about to be eaten up, there is a habit of cluster transfer. The larvae crawl or droop quickly after being frightened, and the last instar larvae will bounce to the ground and arch into a bridge shape when they perch, and can eat all the old molts after peeling. Mature larvae pupate on host trees or climb other trees and weeds. The continuous high temperature and drought weather from May to June often causes the occurrence of the pest.

3. Prevention and control methods

Forestry control: banded mixed afforestation can be used for Phoenix wood night moth afforestation, timely grafting, seriously do a good job of management and protection after grafting, such as unbinding, except before, in order to restrain the reproduction and reduction of this pest.

Artificial control: the larvae with nocturnal moth were artificially killed in the nursery. Light traps and kills adults of Noctuidae mostly have phototaxis and can be trapped and killed by light.

Biological control: protection and utilization of natural enemies, such as ants, ladybugs, wasps, wasps, flies, lacewings, beneficial birds, weaving and other natural enemies in nurseries and woodlands.

Chemical control:

(1) spray 1000 times of 50% fenitrothion EC, or 1000-1500 times of 50% dichlorvos EC, or 50% dimethoate EC, or malathion EC 800 times, or 2000 times of phoxim EC, or 50% parathion EC, or 1000-1500 times of dimethophos crystals, or 50% isocarbophos emulsion, or 50% methamidophos emulsion. Or 1500-fold solution of 25% carbaryl wettable agent, or 2.5% cypermethrin, or 20% cypermethrin EC 3000-5000 times, or 10% cypermethrin EC 2000-3000 times per hectare, or 2000-3000 times of 20% gel suspension of Miaozang 3.

(2) the larvae in the eaten shoots can be dried with 50% monocrotophos EC or 40% omethoate EC, or smeared with 50% fenitrothion EC or 50% dibromophos EC with a 40-fold solution.