Major diseases and insect pests of tea

Major diseases and insect pests of tea

I. What are the main pest of tea? How scientific control?

1, tea leafhopper: pest mainly in adults, nymphs sucking sap of young shoots of tea, female adults lay eggs in young shoots in the stem, resulting in the growth of tea blocked, killed shoots curl, hardened, tip, margin red Brown scorch.

Camellia areas of low pest occurred in 12-13 generations, damage peak from May to June and September-October; mountain areas occurred in 8-9 on behalf of the insect, damage peak from July to September. To adults in the tea, legumes and weeds on the winter. Adults lay eggs on new shoots more than the second,

Clover in between the spears.

Control methods: (1) strengthen the tea garden management, clear the weeds between the garden and promptly picked several batches, eggs and reduce the deterioration of nutrition and breeding conditions, alleviate the hazard. (2) serious tea, winter insect population base, grasp the end of November to March next year

In mid-spraying malathion 50%, or 1,000 times phoxim to eliminate the winter Insect. (3) picking season forecasts based on insect nymphs before the peak in the use of biological pesticides TEMPO 1000 times or 2000 times 80% or 98% dichlorvos Bataan 1000 --- 1500 times.

2, tea mites: Tea mites are second only to tea on the harmfulness of a class of important leafhopper pest, because the body small, generally difficult to detect the naked eye, to be 10-fold increase in the microscope to observe the clear. Occurrence in the city are tea orange gall mite, gall mite of tea

, Tea mite be short, coffee and side small mite mites eat tarsal line.

3, tea orange gall mite: more common occurrence in the city, mainly in order to become, if taking into leaves and leaves mites sap, resulting in yellow-green leaves were killed, the main vein red-brown and dull, small brown dorsal stripe appears , shoots atrophy. Yellow or orange body of adult mites

Red, like the carrot-shaped, body front end has two pairs of feet, young, if pale yellow to light orange yellow mite.

Occurred more than 20 years on behalf of the pest, population mainly in the upper leaves and buds into leaves. High temperature, drought, high rainfall, a long period of rain environment, the number of small tea gardens insects, harmful light. There are two obvious peaks throughout the year, the first time in May-June, the second usually in the high

Temperature after drought.

Control methods: ① the end of autumn tea, late in November before the step of 0.5 degrees Baume lime sulfur spray to reduce the overwintering insect population base. ② implement batch picking times, can reduce insect population numbers. ③ In the event of spraying before the peak of 20% or 15% pyridaben eliminate mites Ling

2000 to 3000-fold or 25% buprofezin 800 - 1000 times.

4, tea mite tarsal lines: also known as lateral tarsal line mites eat, tea, line of semi-tarsal mites. As if the mites inhabit the suction surface of leaf juice, tea bud damage, the victim appeared rusty dorsal, thickened hardened, tip twisted deformity. Shoots atrophy. The mites occurred in 20 - 30 generations, to

Shoots of female adults in the residue, scales, petiole. Joint points and winter weeds. Hot and dry climate and environment conducive to its occurrence. Generally more dangerous place severe summer tea.

Control methods: light tea, orange gall mite.

5, gall mite of tea: The main damage as leaves and old leaves, the victim was tarnished bronze leaves, leaf veins along the dust clouds of white wax-like shed shell, leaves crisp easy to crack, a large number of severe defoliation.

The mites occurred in more than 10 generations to the dorsal adult mites overwinter in the tea. Favorable high-temperature dry season occurs throughout the year to July-October place height.

Control Method: Reference tea orange gall mite, but picking them in batches several times invalid.

6, tea mite be short: in order to become, if the mites sucking the juice into the leaves or old leaves, causing leaves lose their luster, dorsal often purple patch, the main veins and petioles brown, post-rotten, causing a large number of fallen leaves. The mites occurred in about 10 generations, mainly clustered in female adults

1-6 cm of soil under the root of the neck winter tea, a few in the dorsal, axillary buds and leaves in the winter. Most of the female mite tea, line of parthenogenesis, the main habitat of the dorsal hazards. Year to 7 - September hot dry season serious harm.

Control methods: (1) do a good job drought tea, tea leaves and remove weeds, improve management, enhance tree vigor and improve resilience. (2) after the end of autumn tea, before winter mites 0.3-0.4 degrees Baume spraying lime sulfur to control. (3) made in the mite

20% of students sprayed before peak or 15% pyridaben mites off times or 73% of the 2000-3000 Spirit Propargite 2000 times or 25% times the control quinalphos 1000-1500.

7, coffee, small red mite: as if the mite to mite into the leaf substance abuse, the victim leaves the local red, then dark red spots and dull. Dew is dry, the leaf surface shows a layer of fine silk, hand pinching the number of mites that see that many leaves stained with blood red spots, take a closer look leaves

Red worms crawling, there are many white mite molting near the body shell and egg shell.

Occurred in 10 --- 20 generations, generations overlap. Leaves more habitat damage. Eggs produced in the leaves of the front and scattered to the main lateral veins on both sides, and depression for many. Early, severe damage in autumn and winter.

Control methods: a short reference to tea, to be mites.

8, the tea aphid: the city but easy to control common garden pests. Polymer in the new shoots of tea aphid dorsal and often shoots the next, two leaves at most, the port needle into the leaves from time to time try to substance abuse within the organization, causing shoots atrophy, elongation stopped, or even shoot dead buds, and its excretion

Objects "honeydew" and can not only pollute the young shoots of coal induced disease. Occurred more than 20 generations a year, all the eggs or no dorsal fin aphid winter, early spring tea leaves more in the insect population on the lower leaves, gradually to the upper part of the spring as buds after shoot transfer, less summer insect population, and to

The lower part is more central than in autumn and bud tip as much.

Control methods: (1) timely pick several batches. (2) Pharmacy dimethoate 40% is usually used, 50% phoxim, 80% dichlorvos spraying 2000 times, especially to wet the back.

9, spiny whitefly: local tea in the city cause serious harm. Larvae together with the dorsal, fixed taking juice and excretion "honeydew" soot induced disease occurs. Killed leaves black, a large number of severe defoliation, resulting in weak grower, yield and quality of tea

.

Occurred in four generations of the insect to mature larvae overwinter in the dorsal, pupate the following year in March, April, and mid-emergence. Generations of larvae were in late April to late June, late June to early July, mid-July to early August and early October to December

. Oviposition in the dorsal, after the newly hatched nymphs crawl, that is fixed suck juice hazards.

Control methods: (1) strengthen the tea garden management: combination of pruning, Taiwan, mow, cultivation, weed and improve the conditions of air and light tea inhibit its occurrence. (2) biological control: The Weber Block cinerea insect powder 0.5-1.0 kg / mu or spraying method that is linked to bacterial branch

Block cinerea with a Webb worm hanging branches were placed around the bundle of tea, per square meter of 5 - 10 technology. (3) chemical control: According to the prediction of insect spray in 25% of eggs hatching buprofezin Uranus 800 times or 25% or 50% phoxim 1000 times 1000 times, be sure to pay attention to wet the leaves

Back.

10, Wen Li as a tea: black tea and weevil. Local tea cause serious harm our city. Larvae eat fibrous roots in the soil, mainly in the adult Yaoshi leaves, resulting in curved blade edge nick. All Garden Grottoes bald serious vein, impact on tea production and quality

Sound great.

Generation occurred one year to the larvae in the soil under the canopy of tea in the winter cluster, the following year after another pupate in late March, early April began to eclosion, excavated between 5-June for the adult infestation peak. A suspended animation of adult, the case shocked the flinching landing.

Control methods: (1) plow tillage, in addition to killing larvae and pupae can be. (2) the use of suspended animation adult sex, floors, plastic film, and then focus on eradication of forced vibration down. (3) in the adult unearthed before the applicator 871 Beauveria bassiana powder, mu powder 1 - 2 公斤 soil mixed with fine soil application

Above. (4) adult unearthed spraying before the peak of 2.5% or 98% of Uranus 800 times or 800 times Bataan 0.5-1.0 powder with 871 kg / mu mix.

11, tea leaf roller: mass 俗称 "package leaf beetle", "Volume Xin bug", the larvae roll leaves Results Nenshao or bonded into a shell a few pieces of leaves, up to 4 - 10 leaves, the larvae feeding on potential hazards which . Greatly reduce the serious tea quality and yield. Insect FAT

6 on behalf of students to mature larvae overwinter in the insect in the bud. See the beginning of each generation of larvae often in late March, late May, late July, early August, early September, early November, overlapping generations occur, the larvae of six age. Adults with phototaxis in blocks prolific egg

Foliage.

Control methods: (1) readily removed egg masses, bud worms, and to protect the parasitic wasp. (2) light trap and kill adults. (3) master control spraying 1,2-instar larvae. DDVP 80% can be used 1000 times or 2.5% or 25% quinalphos Uranus 800 times.

12, the tea cockroach moth: worm, also known as stem borers, the distribution of the tea growing area in our city. Moth larvae usually branches Zhusi branches, shoots stop elongation of the early branches, the latter bore hollow parts of branches all over the dead leaves and branches. Generation occurred in the insect order branches in the winter moth larvae. Times

Pupate in late March, pupate in late April peak, 5 months late for the adult peak. Adults lay eggs in young shoots two clover internode. Immature insects were young shoots a few days later, the top of the shoots wither into the branches to the third instar within the post, located near the end bore. Boring Road, straight over

Every bite a certain distance to the shadow side vents to wear nearly round, the bottom hole plot flocculent debris, leaves or the ground near the dark yellow powder product short cylindrical fecal pellets.

Control methods: (1) adult emergence peak, the light trap and kill adults. (2) after the end of autumn tea, from the next 5-inch vent at the bottom, cut off branches and kill the branches of insect larvae.

13, mosses and lichens: moss is a higher green plants, living in damp land, lichens are symbiotic bacteria and algae, according to form into fronds, shells, branched lichens, they can stem from the Ministry of tea up spread, causing brown rot of tea tree bark, long

Potential debilitating and seriously affect the normal growth and development. Raining in the spring or the rainy season, the fastest growing in the hot summer and cold winter, and stop growing.

Control methods: (1) strengthen field management, timely cultivation, weed and the slack season, in the rain with bamboo and other tools to scrape and readily removed from the park. Tea to keep clean, rational fertilization, cultivation strong tree vigor. (2) equal with 1% lime Bordeaux

Liquid injection, the effect of up to 90% in winter to be boiled with ash concentration painted leaching solution, but also have a good effect.

Second, What are the main diseases of tea? How scientific control?

1, the white spot of tea:

(1) symptoms: mainly against young leaves and shoots. Birth brown pinhead dots, after a small lesion gradually expanded into a round, less than 2 mm in diameter, the central depression, pale, brown around the bulge line. Black pellets scattered lesion late point, a tender

Lesions on leaves of up to hundred.

(2) the incidence pattern: The disease is a type of disease at low temperature and humidity. Mycelia on the patient leaves the winter, next spring, when the temperature rose to more than l0 ℃, in the high humidity conditions, the lesion on the formation of conidia, spread by wind and rain, against the immature bud tip. Low-temperature

Spring rain season, the most suitable for spore formation, causing epidemic disease. Morbidity mountains and tea plantation. Barren soil, N fertilizer applied bias, mismanagement are easy to disease.

(3) control methods: ① strengthening management, increasing P and K applied to enhance tree vigor, improve disease resistance. ② budding spraying in the spring protection, available 70% or 50% carbendazim thiophanate-methyl 1000 times every 7 days or so and then spray again.

2, tea cakes disease

Tea, also known as swelling disease, often occurs in high altitude tea, harm leaves, young shoots, petioles, diseased leaves bitter tea made from fragile.

(1) Symptoms: Early leaf spot appears on the small yellow Shuizi Zhuang, then gradually expand into a light brown spots, sharp margin, positive depression, back protruding into the pie, the raw off-white powder, and changed to dark brown ulcer-like spots.

(2) incidence of laws: The mycelium, or summering in the diseased leaves in the winter. Temperature 15 - 20 ℃, relative humidity above 85% morbidity environment. General from March to May and September-October between serious harm. Nightside than a front garden slopes prone disease, extensive management, weed

Ridden, improper fertilization, shade garden is also easy to disease.

(3) control methods: ① tea cake tea tree can be transported when the disease spread, quarantine should be strengthened. ② ground weeds, proper pruning tea rooms, to promote air and light, reduce the incidence. ③ Adding P and K, increased disease resistance, winter or early spring combined tea garden management

Removal of diseased leaves, which can effectively reduce the virus base. ④ picking tea in the early stages, spraying with 70% or 20% thiophanate-methyl Triadimefon 1000-fold, 10-15 days and spray again.

3, tea anthrax

⑴ Symptoms: The main hazards into the leaves or old leaves, lesions produce more from the leaf margin or tip, first as a Shuizi Zhuang; dark green circle, then gradually expanding or large irregular-shaped spots, brown or light brown color Finally, change gray, black pellets above the scattered points

. Lesion is no Physalospora, margin uplift tan lines, and the healthy part of the world was.

(2) incidence of laws: the mycelia in diseased leaves in the winter, the following year when the temperature rose to 20 ℃, relative humidity above 80% the formation of spores spread by rain. Humidity 25 - 27 ℃, high humidity conditions most conducive to disease. Year to the rainy season and autumn rainy season

Section height occurred. Cutting tea, Taiwan tea Kariya, young leaves, high moisture content, is conducive to disease. Incidence of N fertilizer applied bias tea is also heavy.

(3) control methods: ① strengthening tea garden management, Adding P, K fertilizer, improved disease resistance of tea. ② the early stages, 70% thiophanate-methyl spray chlorothalonil 500-800 times or times of 1000-1500.

4, tea blight

Mainly against old leaves, leaves, fruit, branches may also occur. Lesion occurred in the tip, leaf margin, showing semi-circular or irregular in shape, first as brown, Shuizi Zhuang and later brown, wavy on its Physalospora, moire-like shape. Finally, the Central lesion

Out changing the central gray, gray-black pellets on the raw points: along the Physalospora order. Disease at high temperature (20 ℃ above) and humidity (relative humidity above 80%) under the conditions of the incidence height. Weak grower, mismanagement, suffered damage, the tea garden pest incidence is also important.

Control Methods: According to tea anthracnose.

5, round spot of tea

To occur on old leaves into leaves and more, starting with the tip, leaf margin produces yellow-green dots, then gradually expand the round, semi-circular or irregular lesions. Brown lesions, concentric circles Physalospora significantly, post-central variable gray, with thick black students

Coarse pellets points arranged along the ring Physalospora, often brown lesion edge uplift line, the bacteria from the wound tissue to generate new invasive lesions of tea, hot and humid in summer and autumn the incidence more. Pruning or machine tea garden, tea garden pests, incidence of multiple severe. Tree

Potential weakness, poor drainage and tea are also important disease. Control Methods: According to tea anthracnose.