#Sannong Knowledge Sharing Home ##Jingqin Farmer Online Learning Festival ##水稻病虫害 #
At the beginning of the rice insect situation last year, there was a lot of news about a new "golden rice vertical", and there were many people who disagreed. Many searches have verified that this insect does exist, the scientific name is rice leaf borer, many years ago in Sichuan more extensive harm, to last year's outbreak before, has not seen its trace for many years. Since the beginning of June last year, from Guangxi, Hunan, Jiangxi, Fujian and other places have been sent out of the information of its harm, because the insect body is golden yellow, so it is called "golden leaf curl", farmers commonly used avermectin, chlorantran benzamide and other conventional drugs are not effective.
Latest field hazard situation (10 acres of field can be rolled white in 3 days)
The blades are severely damaged
Symptoms of rice field victimization
Symptoms of leaf damage
The following is the "Golden Leaf Curler" found in the field (Rice Leaf Borer)
Hazard blades
Close-up view of the rice leaf borer
Rice leaf borer
Ordinary rice longitudinal curl leaf borer in the same rice field
(1) Basic information
Rice striated longitudinal leaf borer, also known as yellow longitudinal curly leaf borer, striated brush whisker borer, belongs to lepidoptera, moth family. Widely distributed in provinces from Hainan, Guangdong, Guangxi, the Yangtze River Basin to Liaoning, Sichuan is more serious. The last major event occurred in 1982. The symptoms of harm are similar to those of rice longitudinal, but the amount of food is larger, the resistance to drugs is enhanced, the harm to rice is more serious, and when it is severe, it will drill the leaf sheath and stalk, and the prevention effect of conventional drugs is poor, and it is necessary to change the formula and thinking of the drug.
(2) Morphological characteristics
(1) Adult insects: the body length is 5-6 mm, the wing spread is 12~15 mm, and the body size is slightly smaller than that of the rice longitudinal leaf borer. The forewings are pale yellow, with brown bands, the leading margin is transverse, the outer longitudinal band is C-shaped, the inner and outer lines are parallel, and the midline has 2 black-brown inner transverse bands directly reaching the posterior edge of the wings; the male ejaculatory ducts and appendages are long, the seminal vesicles and vas deferens are short, the organ flap ossification is weak, the surface is densely covered with long hairs, and the impotence sac has two bone spurs (see figure below); the female ovaries are short, the lateral and middle fallopian tubes are similar in length, and the mating sac is long.
Left: striated longitudinal roll; right: conventional rice longitudinal. (Source: Institute of Plant Protection, Guangdong Academy of Agricultural Sciences)
The difference between the patterned longitudinal leaf borer and the adult rice longitudinal leaf borer: 1. The former wing is pale yellow, the transverse and longitudinal bands are brown, the rice longitudinal wings are golden yellow, and the transverse and longitudinal bands are black; 2. The former forewing is transverse, close to 1/4 of the wing width, ending at the outer line. The latter has a narrow transverse band, about 1/8 of the wing width; 3. The inner edge of the former is distinctly "C" shaped, and the inner edge of the latter is slightly curved; 4. The inner and outer lines of the former forewing are almost parallel, but the rice longitudinal is close to each other.
(2) Eggs: light yellow, flat, oval, about 1 cm long.
(3) Larvae: Rice striped longitudinal leaf borer larvae are pale yellow, the anterior thorax, middle posterior thorax and abdomen have 2, 12 and 5 bone pieces, divided into 1, 3 and 2 rows; the pupae have finger-like protrusions at the end, which have 8 bristles on it; the old mature larvae are about 15 mm long, the color is yellower, the dorsal plate of the anterior thorax is brown, there is a brown spot on each side, and there is no black-brown spot on the back of the middle and posterior chest.
Rice longitudinal leaf borer is different from rice longitudinal larvae: (1) the former anterior thorax and dorsal bone pieces are yellowish brown, and there are no obvious brown spots on the surface; there are multiple stripes composed of brown spots in the center, sides and posterior margin of the anterior and posterior bone pieces of rice longitudinal larvae; (2) the former middle and posterior sternum slices are yellowish; the latter middle and posterior sternum pieces are dark in color, black or partially black.
(4) Pupa: yellowish brown when ripe, the posterior margin of the back of each abdominal segment is smooth, and the anterior margin is free of thorny hairs and protrusions.
(3) Living habits
Adults are not phototropic and emerge diurnally and nocturnally. The eggs are laid on the back of the rice leaves, often 3 to 5 grains are laid in one place, arranged in the shape of fish scales, and the egg stage is 3-7 days. Conventional rice longitudinal lays 1 egg each, up to 2 in parallel. The rest are basically the same.
(4) Occurrence law
There are 3-5 generations of larvae per year, the overwintering larvae begin to pupate at the end of April and the beginning of May and the beginning of May and June.
Prevention programmes:
Optionally containing beetle mite nitrile, indigovirus + lice mite urea for control, even spray, water spray, 30 kg of liquid per mu, drone 1.5 liters per mu.