Today, Zongfu fruit planting editor mainly shares the control method of "peach white stripe purple spotted moth", the insect in mid-to-late April to May the first generation of larvae began to hatch, some places occur 2 belts, 3 belts, according to different regions have certain differences. So, how can growers take precautions? What measures should growers take to prevent it? Let's take a look at it with Xiaobian!
Peach white striped purple spotted moth adult
The peach white striped purple spotted moth, also known as the peach white striped leaf borer, belongs to the lepidoptera family.
★ Distribution and host
At present, it is known that Shanxi, Henan, Hebei and other provinces have distribution, mainly peach trees, almond trees, plum trees, cherries and other stone fruit trees.
Peach white striped purple spotted moth harmful symptoms
★ Harmful symptoms
Larvae eat leaves, the first larvae eat the epidermis and leaf flesh, the slightly larger tip end spits silk netting leaves into a nest, the constant head to more than ten head cluster nests eat leaves into missing and holes, with the growth of insect age, the nest expands, the petiole is bitten off in the nest, and many fecal particles are adhered to the silk net. There are also individually coiled leaves for victims.
Peach white striped purple spotted moth: larval insect
★ Morphological characteristics
Adults are 8 to 10 mm long, with a wingspan of 18–20 mm, grey to dark grey, and a pale yellowish-brown at the posterior margin of each ventral segment. The antennae are filamentous , and the base of the male whip segment has dark gray to black long hairs that are slightly spherical. The forewings are dark purple , with a white transverse band at 2/5 of the base , and some individuals have white bands from the base of the leading edge to the white band. The hindwings are dark on the grey outer margin.
The appendages are all 5 sections, which are gray and white. The eggs are oblong-oval, 0.8-0.9 mm long, with a initial pale yellowish-white gradient of lilac red. The larvae are 15-18 mm long, the head is gray-green with black markings, the body is mostly purple-brown, the front thorax shield is gray-green, the dorsal line is wide black-brown, and there are two pale yellow cloud-like longitudinal lines on each side, so the body side is each in the form of 3 purple-brown longitudinal lines, and the hip plate is dark brown or purple-black gastropod hook tricycle ring, more than 60.
No hips. The low and middle-aged larvae are pale green to green, with a light brown cloud-like pattern on the head, a broad dark green dorsal line, and two yellow-green longitudinal lines on each side, so the body side is each in the form of three green longitudinal lines. Pupae are 8–10 mm long, with emerald green cephalothorax and wing buds, yellowish-brown abdomen, and dark green dorsal line. The dorsal surface of the caudal segment is triangularly raised dark brown with 6 rump spines. Cocoon spindle-shaped, 11-13 mm long, silky gray-brown.
Peach white striped purple spotted moth: middle-aged larvae
★ Habits of life
In Shanxi Province, there are 2 generations per year, and the cocoon bat overwinters in the sub-soil layer of the canopy, and a few overwinter in the skin cracks and tree holes. Overwintering adults occur from early May to mid-June, and the first generation of adults occurs from early July to early August. Adults are diurnal and nocturnal; the eggs are mostly scattered on both sides of the main vein near the base of the dorsal back of the upper leaf of the branch, and there are also 2-3 grains produced together, and there are more than 10 grains on 1 leaf, and the egg stage is about 15 days. The first generation of larvae begin to hatch in late May, and in the second sentence of June, they begin to mature into the soil and marry in a cocoon, pupaling for about 15 days.
The second generation of eggs is 10-13 days old, hatching begins in the middle sentence in July, and matures into the soil and cocoons to pupate overwintering in mid-August. Adult worms live for 2-13 days, mostly 7-8 days, and each female can lay 9-189 eggs, generally more than 90 grains. The front is apricot red. The hatching nymphs are pale yellowish brown, oblate-ovate, with the broadest midfoot and hindfoot, and 0.3 mm long. Eyes, antennae and feet.
The antennae are 5 segments long and the feet are developed to crawl. The abdomen has two tail hairs at the end. There are two glandular holes between the eyes, which secrete woolly hairs to cover the body. After molting, the eye, antennae, feet, and tail hairs all degenerate or disappear, and begin to secrete a shell, and the skin under the first molt is negative on the shell, called the shell point. Females are similar in shape to female adults.
Peach white striped purple spotted moth: an old larvae
The annual generation varies from place to place, with 5 generations occurring in Guangdong, 3 generations occurring in Zhejiang, and 2 generations occurring in northern provinces. Generations of nymphs in Zhejiang: the first generation of April to May, the second generation of June to July, the third generation of August to September.
The northern provinces overwinter on the branches with second-generation fertilized females. The start of the following year and the date of spawning vary by region. According to observations on peach trees in Taigu, Shanxi Province, around the middle of March, the peach trees began to suck as a pest after germination, the insect body rapidly expanded, began to lay eggs in late April, the end of April and the beginning of May is the peak of spawning, and the beginning of May is the end. The female dies of dry shrinkage after laying her eggs.
The egg stage is about 5 days, and the incubation begins in early May, the incubation period is in the middle of May, the feathering begins in mid-June, and the feathering peak begins in late June. After the tail is crossed, the male dies, the female gradually expands her abdomen, and the egg laying begins in mid-July, and the egg laying period is the peak in late July, with an egg period of about 10 days.
Incubation begins in late July and is at its peak at the end of July. Nymphs begin to feather in mid-to-late August, and feathering peaks at the end of August. After mating, the females continue to overwinter until late autumn.
In general, the number of female insects in newly infected plants is larger; the number of male insects that have been infected for a long time increases gradually, and in severe cases, the male shells overlap densely, and a layer of cotton wool seems to be hung on the branches.
Natural enemy of the peach white striped purple spotted moth: red-spotted lip ladybug
★ Prevention and control methods
1. Artificial prevention and control. You can use a hard bristle brush or a fine steel wire brush to brush off the insect body on the branches. Combined with plastic pruning (including summer pruning and winter pruning and combined with winter garden clearing work), severely damaged branches are cut.
Drug control: Chlorpyrifos
2. Drug prevention and treatment. Before the dispersal transfer of wax powder shells, the nymph wandering period, about mid-to-late May, is a favorable time for drug control, which is a favorable time to choose organophosphorus insecticide 45% chlorpyrifos emulsion 1500-2000 times liquid, 50% malathion or borage pine emulsion 1000 times liquid, or 80% dichlorvos emulsion l500 times liquid.
3. Biological control. Protect the use of natural enemies, in April and June, when the red dot lip ladybird occurs in large numbers, do not use highly toxic pesticides, and choose low-toxic pesticides such as biological pesticides or thiazides to avoid the death of natural enemies.
★ Summary: Any fruit tree focuses on management, one species, nine divisions, with early prevention as the mainstay and comprehensive prevention as the supplement. This year a certain pest appeared at a certain time, next year appeared almost the same time, the experience is accumulated over time, the longer the time I believe you will also become a planting expert.