Why are the leaves covered with sores? Why do vegetable farmers fight drugs in the field in three days? Why do a large number of seedlings die in bizarre? Behind many vicious incidents, a bug is doing it! That's right, it is the number one pest of leafy vegetables - yellow stripe.
Yellow striped jumpsuits are also known as vegetable dumplings, soil flea, etc. in some places. Commonly, there are yellow song strips, yellow strips, yellow strips, yellow strips, and yellow strips. Widespread hazard crops, especially cruciferous plants.
Yellow stripe harm
They often feed on the back of a leaf, small in size, capable of flying and jumping, very lively, live for about 50 days, and can live for as long as 1 year. Foraging the leaves, often causing dense leaf holes covered with dense oval holes, so that the leaves withered, reduced photosynthesis, loss of commodity value. Jellyfish tend to be tender and tend to feed on the tender parts of the leaves, so the seedlings suffer the most and often cause damage.
Adult egg laying spawned in the earth seam around the roots of the plant or on fine roots. The length of the egg is about 0.3 mm. It is oval, light yellow translucent, and the egg period is 4 to 9 days.
Yellow larvae have 3 instar larvae and 11 to 16 days in larvae. The mature larvae have a body length of about 4 mm, a long cylindrical shape, yellowish-white, with no obvious sarcoma and fine hairs.
Larval damage symptoms
The newly hatched larvae feed along the fibrous roots to the main root, stripping the root of the epidermis, forming irregular strips of scars, and can also bite off the fibrous roots, causing the plant leaves to die and cause rot to cause the spread of soft rot.
Old mature larvae are often used as soil chambers in soils 3 to 7 cm deep. It is about 2 mm long, elliptical, milky white, with its head concealed below the front of the chest, wing buds and vines reaching the fifth abdominal segment, and sparse brown bristles on the back of the chest. At the end of the abdomen there is a pair of fork closure protrusions with brown ends. The flood season is 11-13 days.
Difficulties in combating yellow striped jumps
Outstanding athletic ability
Because the hind leg leg is inflated and jumps very well, it is named. It is very sensitive to pharmacological agents. When people fight drugs, even a slight pharmacological fog can feel it. They immediately jump to the ground or get into the soil to escape. This is a great obstacle to prevention and control.
Strong resistance to drugs
With the continuous cropping of cruciferous vegetables, overuse of chemical agents, etc., the resistance of hopbee has become stronger. In particular, frequent use of the same agent for prevention and control will accelerate the development of drug resistance.
Large population base
The occurrence of algebra in one year of leaping from north to south gradually increases in the southern region, and it can occur in more than ten generations in the southern region. And adult life is extremely long, an average of 50 days, up to 1 year. Coupled with the prevalence of facility cultivation, it provides a rich source of food for winter jumps, and the population base of insect population increases year by year.
Fake dead
After the adult is frightened, it will jump off the leaves and turn over to death after landing. After determining safety, it should be eaten and eaten, which should increase the difficulty of prevention and treatment.
Difficult to fight drugs
Spawning in the soil after mating, the larvae eat the roots and the adults eat the leaves. This makes it more difficult to fight drugs. Usually, in order to save labor or medication costs, growers either spray or soak up roots, and the prevention and treatment work is very difficult.
Comprehensive Prevention and Control of Flea
1, timely control of a hop
â— During the season when the temperature is high, most of the adult nocturnal insects sneak back into the soil. Generally, spraying is more difficult to kill. It can be sprayed in the morning from 7:00 to 8:00 or from 5:00 to 6:00 in the afternoon. At this time, the activeness of the adult is poor and the efficacy is good.
â— In the fall and winter season, beetles are active around 10:00 am and 3:00 pm and 4:00 pm. They are easily disturbed and flee in all directions, but they are often quiet at the bottom of the leaves at noon. Therefore, the insect can be sprayed when the adult has just emerged in the morning, or when the adult activity is in a "fatigue" state at noon and afternoon.
2, first outside and then inside
There is a strong jump in the beak, spraying from the inside out, the beetle is easy to escape, so when spraying, care should be taken from the side of the field to spray in order to prevent the adults with strong jumping ability to escape.
â— If the plot is wider, it should be sprayed around the perimeter to kill insects.
◠The plots are narrow and long. They can be sprayed at one end and then sprayed from the other end so as to “surveillance and intercept†to prevent adult worms from fleeing.
â— Spraying should be light and do not disturb adults.
3, the upper and lower governance
A jump shot only considers spraying on the ground, which tends to be less effective. Not only does the fleabee harm the crop leaves, but it also harms the roots of the crops, and it should take the same treatment from top to bottom.
â— After crops are harvested, the stubble leaves will be completely collected, the weeds will be destroyed, and the soil will be sun-dried before sowing so as to eliminate some of the insects and improve the wintering environment of the insects.
â— In addition, lay a plastic film to prevent adults from laying their eggs on the roots.
â— In heavy-hazardous areas, the soil should be treated first before or after planting, or soil or insecticide should be poisoned.
Note alternate medication
There are many medicines that can prevent and control beetle beetles, but single-use medicines are susceptible to drug resistance and affect the control effect.
â— When it is found that the larvae begin to harm the roots of vegetables, use 90% crystal trichlorfon or 50% phoxim EC 1000-1500 times to irrigate the roots one by one. Each liquid is 100-200 ml.
â— When there is a hazard in the field, acetamiprid, bupropion and pyrethroid insecticides can be sprayed. They can be mixed or used interchangeably, but do not use a single drug.
â— In addition to chemical control, physical control can also be performed by using the yellowishness and phototaxis of the armor. Such as yellow traps, set up insect nets, lamp traps and other chemical prevention and control set.