As the weather has cooled down significantly in recent days, potato growers have experienced some problems.
On December 23, 2018, Deng Fugui from Wuwei City, Gansu Province, asked the farmer in the "Q&A" of the farmer's housekeeper: What is this fly? What pesticides are used?
As shown in the following figure:
<h1>The agricultural steward expert gives the answer according to the picture display:</h1>
Feng Tao (Shou County, Lu'an City, Anhui Province, good at plant protection technology)
Bifenthrin + paracycline control can be used.
Su Wentao (Ganjingzi District, Dalian City, Liaoning Province, good at plant protection technology)
Fly pests can be controlled with avermectin + alenopherolamine.
chenjn10 (Hulunbuir, Inner Mongolia)
It can be used with thiamethoxine, spironoid ethyl ester, kung fu permethrin, thiazide, enididazone, fufenazine, alenazeramine, pyritone, bifenerate, plus silicone auxiliaries for control, alternate medication.
Liu Fenghua (Dongming County, Heze City, Shandong Province, the 4th Golden Straw Hat Expert)
Flies, spray kung fu, bifenthrin control.
Li Chao (Xinhua District, Shijiazhuang City, Hebei Province, good at plant protection technology)
Spotted flies are recommended for foliar spraying of Avi pyrimidine or perchlorinated amine or DuPont Benedicil
<h1>Farmer Butler Knowledge Classroom:</h1>
Leafminer:
First, life habits
imago:
Adults are active during the day and suck on nectar. Spawning is mostly young green leaves, which are produced in the leaf flesh at the edge of the leaf back, especially near the tip of the leaf. Eggs are laid loosely, 1 capsule at a time, and 50 to 100 eggs per female. The lifespan of adult insects is generally 7 to 20 days, and when the temperature is high, it is 4 to 10 days.
larvae:
The larvae feed on leaf flesh after hatching, and the tunnel widens as the insect ages. The larvae mature at 3 instars, i.e. pupate at the end of the tunnel.
Harmful features:
The larvae feed in the soft tissues under the leaf epidermis, eat the leaf flesh, leave only the epidermis, form a gray-white snake-shaped diving channel, with black insect feces, affecting growth, when the damage is serious, the leaf tissue is almost all damaged, and the leaf is covered with submersible channels, causing the entire leaf to die.
Second, the law of occurrence
Generations: 4 to 5 generations occur annually in North China.
Overwintering: Pupate overwinters inside the damaged leaves.
Period: Adults feather in mid-to-late April of the following spring, the first generation of larvae are perennial seedlings, rapeseed, residual cruciferous vegetables and peas, and the most harmful is from May to June.
Climate: Rarely seen in summer when temperatures are high, but active in autumn, but not in large numbers.
Area of occurrence: Distributed throughout the country.
3. Morphological characteristics
Adults: Yellow forehead, black antennae. The midfoot back plate (including the small shield) is black-gray. The wings are 2.2 to 2.6 mm long and transparent, but have iridescent reflections.
Balance stick yellow white. The feet are black except for the yellowish-white part of the leg joints.
Eggs: about 0.3 mm long. Oblong oval. milky white. (3) Larvae. The posterior valve has 3 orifices and openings on each side, pupating within the leaf blades. The old mature larvae are yellow, about 3 mm long, the body surface is smooth and transparent, the front valve is forked and protruding forward, and the rear valve is dorsal at the end of the abdomen, which is a pair of obvious small protrusions. The pupa is about 2.5 mm long, oblong oval, yellow to black-brown.
Fourth, agricultural prevention and control
After harvesting, it is necessary to remove the leaves in the field in time.
Before the large number of leafminer flies occurs in early spring, timely eradication of weeds in the field and the field, combined with medium tillage weeding, remove the leaves with a large amount of insects in the lower part of the pea, and concentrate them on treatment to reduce the source of insects.
Physical control: In the heyday of adult insects, use fly-killing paper or booby-trap plates to trap adults, and set up trap plates to 15 /mu.
Medication Reference:
60% fly-killing amine water dispersible granules (low toxicity) use 20-25 g/mu spray
21.8% avermectin water emulsion (low toxicity) use 40-80 ml/acre spray
16% Perchloride Insecticidal Monohydrous Emulsion (Moderate Toxicity) uses 750-1125 spray
40% Avi Dichlorvos Emulsion (Moderate) use 900-1200 spray
2.4% Avi Perchlorine Wettable Powder (Low Toxicity) Use 42-84 g/mu spray
10% Cyanoxamide Bromide Dispersible Oil Suspension (Minimally Toxic) Use 14-24 ml/acre spray
20% avivicide single microemulsion (low toxicity) using 30-60 ml/mu spray
10% fly-killing amine suspension (low toxicity) use 100-150 g/mu spray
11% avivine serotonin suspension (low toxicity) use 45-70 ml/mu spray
1.8% Avipyridine microemulsion (low toxicity) use 30-60 ml/mu spray
4.5% High Potency Cypermethrin Emulsion (Low Toxicity) Use 40-50 ml/mu spray