Comprehensive Control of Taro "Taro blast"

Taro is one of the most common vegetables in our lives. It grows in the ground and has a hairy appearance. It tastes very delicious. And taro leaves are also long more special, it long and lotus leaf a bit similar.

What is taro?

Taro, also known as taro, taro, Araceae underground bulbs, shape, meat varies according to varieties, usually edible for small taro. Perennial tuberous plant often cultivated as an annual crop. Leaves shield shape, petiole long and fat, green or purple red; plant base to form short stem, gradually accumulate nutrients fat into fleshy corm, called "taro" or "mother taro," spherical, oval, elliptical or massive, etc.

Taro blight belongs to fungal disease, which usually occurs in plum rain season and midsummer every year. Taro blight seriously reduces the yield of taro, so it is especially necessary to pay attention to the control of taro blight when planting taro.

Symptoms of taro plague: It first occurs on leaves, gradually expands to petioles and corms, and then spreads rapidly to form large spots of ring pattern. If it occurs on leaves, the ring spots on the back of leaves are most obvious, and there are conidia on the periphery of the spots, which are white mold objects. When the disease spots are serious, they gradually wither and rupture; until only the main veins remain on leaves, like broken umbrellas; if it occurs on petioles, it often forms dark brown long oval disease spots, which make leaves and petioles turn yellow until they wither; If it occurs in the bulb, it will cause the whole taro to rot and even destroy.

Comprehensive control method of taro blight

When symptoms of taro plague appear, growers should go deep into taro fields for careful inspection. Once disease spots are found, measures should be taken immediately to eliminate the disease at the initial stage and prevent the spread of the disease.

1. Agricultural measures

① When planting, select taro seeds without disease;

(2) Crop rotation shall be carried out, continuous cropping shall be strictly prohibited, and rotation with rice, corn, peanut, sugarcane and other crops shall be carried out for more than three years;

3. Increase phosphorus and potassium fertilizer and farm organic fertilizer to make leaves and petiole tissue cells thicker and firm, and enhance plant disease resistance. 4. Strengthen field management, clear ditches and drain water in time in rainy season to prevent waterlogging in taro field.

2. Chemical control

Taro blight generally occurs during the rainy season and midsummer, especially under white rain (also known as falling sun water), sunny rain alternate and high temperature and wet midsummer most susceptible disease, once the disease center (tree) is found, the main pesticides for immediate control are:

1 spray bordeaux mixture its production method is: copper sulfate, lime and turpentine each 0.5 kg, dissolved with a small amount of water after mixing together, then add 75 kg of water spray the whole field, spray once every 7 - 8 days, continuous spray 2 - 3 times, the control effect can be more than 90%;

(2) Drenching plants with 1000-fold solution of Dixone, 110 kg solution per mu, once every 10 - 12 days, 3 - 4 times continuously, can effectively control the occurrence of epidemic diseases;

(3) 80ml phytohormone plus 100g topozine mixed with 55kg water spray has special effect on control.

Growing conditions of taro

1, temperature: taro needs high temperature and humidity environmental conditions, day and night temperature difference is conducive to the formation of bulbs, bulb formation period 28~30℃ during the day, 18~20℃ at night is the most suitable.

2. Moisture: taro, whether water taro or dry taro, likes moist natural environmental conditions. The soil is moist during the growth period of dry taro, and a certain water layer is required during the growth period of water taro.

3, light: taro is more resistant to weak light, the light intensity requirements are not very strict, in the scattered light to grow well, the formation and expansion of the bulb requires short day conditions.

4, soil: water taro need to choose paddy field, low-lying land or ditch cultivation. Although drought taro can grow in dry land, but still maintain the ecological type of swamp plants, it is appropriate to choose wet zone planting.

Cultivation techniques of taro

1. Soil preparation and fertilization: taro has a wide adaptability to soil, and it is appropriate to use rich and deep clay soil with strong water retention. After the ground is tidied, furrows are opened according to the row spacing of 80~100 cm, the width of the furrows is 50 cm, and the depth is 35 cm, and then the fertilizer is applied in the furrows. Taro fertilizer needs a large amount, long growth period, first of all to apply sufficient base fertilizer, mu application of high-quality organic fertilizer 2000 kg, 48% potassium sulfate compound fertilizer 60 kg, according to row spacing application.

2. Sowing method: Select the seed taro without diseases and insect pests and no wounds, spread it in the sun for 3~4 days, arrange it closely indoors, cover it with 8~10 cm thick wet sand for germination, and keep the room temperature at 20~25℃. After 20~30 days, the bud length is 3~4 cm and 5 cm. The soil temperature is stable at 10℃. Two seed rows are opened on the ridge, the groove distance is 30 cm, the depth is 7 cm, and the seed taro is arranged after sufficient water is poured in the groove, the plant distance is 33~40 cm, and 4500~5000 plants are planted per mu.

3. Watering management: Do not water taro before emergence, keep soil moist in the middle and late stages, and pay attention to drainage in rainy season. 80 days after emergence, holes and fertilizers are perforated beside the plants in combination with watering. Taro bogey dry soil, yellow leaves in case of drought, dead leaves, but the soil is too wet water is also unfavorable for root growth. The seedling stage should make the soil moisture sufficient, avoid watering. The soil in seedling stage is dry and wet, and attention should be paid to drainage in case of rain.

4. Cultivate soil: During taro seedling stage, combined with topdressing, cultivate grass and warm ground. At the end of seedling, cultivate soil and make cultivation ditch flat. After 20 days, cultivate soil once, 7 cm thick, twice in total. The purpose of cultivating soil is to inhibit the germination and growth of terminal buds of taro and taro, reduce nutrient consumption, make taro fully expand and produce a large number of adventitious roots, and increase the drought resistance of plants.

5. Timely harvest: taro should be harvested in time after maturity. Early-maturing varieties sown in the Yangtze River Basin are mostly harvested from early September to early October, late-sowing varieties are mostly harvested from late September to late October, and middle-late varieties are mostly harvested from late September to early November. Due to market needs can be appropriate early or late harvest, but generally should be harvested before heavy frost, in order to prevent taro from freezing damage.

6. Seed reservation method: taro is selected to grow neatly and consistently in high-yield land, and plants with characteristics of the variety are selected as seed plants. The seed bulbs should be reserved until the above-ground parts are withered and the seed taro is fully harvested in sunny days. The size of seed taro is related to the type, belonging to multi-seed taro should be 25~50 g, the minimum should also be above 15 g, belonging to Kui taro type should be above 25 g.

In rural areas, many ponds are planted with taro, which shows that taro likes to grow in a humid environment. In the process of planting taro, it is very important for disease prevention, so diseases directly affect taro yield.