In the past two days, heavy rainfall hit the south, and the south of the Yangtze River ushered in the strongest rainfall this year. According to the latest statistics, Hunan's heavy rainfall has caused more than 70,000 people to be affected, with a maximum rainfall of 124.2 mm; Fujian's current urban area has accumulated; Taiwan has been hit by heavy rains, and the No. 2 Electromechanical Tower of the First Nuclear Power Plant collapsed. Late on the night of June 1, Liancheng County, Longyan City, Fujian Province was hit by heavy rain, and the whole county experienced heavy rain and partial heavy rain.

According to the monitoring data, from 00 to 7:00 on June 2, there were 14 stations in the county with a rainfall of more than 100 mm, 44 stations with a rainfall of more than 50 mm, and the largest in the city of Quxi County, 178.3 mm, of which the maximum hourly rainfall was Tunxi Town 89.5 mm / hour.

The city is accumulating, the river is soaring, the streets are flooded, and heavy precipitation hits Hunan. From 8:00 on May 31 to 8:00 on the 1st, there were 296 rainstorms in Hunan and 25 heavy rains in towns and villages.

The Central Meteorological Observatory continued to issue a strong blue warning of strong convective weather at 6 o'clock on June 2:

It is expected that there will be thunderstorms or hailstorms in parts of southeastern Hebei, northeastern Shandong, southeastern Henan, southern Fujian, and northern Guangdong, from 08:00 to 3:00 on June 2; northeastern Shandong, southwestern Jiangxi, and Fujian Some areas in the south, Taiwan, western Yunnan, central and northern Guangxi, northern Guangdong have short-term heavy precipitation, with an hourly rainfall of 20-50 mm and local rainfall of over 60 mm.

The Guangxi Meteorological Observatory issued the following forecast on the 2nd:

Tonight, tomorrow, some areas of Guilin, Liuzhou, Hechi, Baise, Laibin, Hezhou and other cities have moderate rain and local heavy rain. Other areas have showers or thunderstorms and partial heavy rain.

On the 4th to 5th, there were heavy rains in parts of northern Guangxi and central Guangxi, some heavy rains to heavy rains and strong convective weather such as short-term thunderstorms and strong winds. There were small to moderate rains and local heavy rains in other areas of our district.

On the 6th, there were heavy rains in parts of Guidong and Guinan, from heavy rains to heavy rains. In other areas, there were showers or thunderstorms and partial heavy rain.

On the 7th, there were showers or thunderstorms in the whole area, and there was heavy rain in parts of southern Guangxi.

From 8 to 9 days, the whole district is cloudy, with showers or thunderstorms in parts of Guidong and Guinan.

Meteorologists reminded that the heavy rainfall process has a wide range, strong precipitation intensity and large accumulated rainfall. It is necessary to pay attention to prevent secondary floods caused by heavy precipitation, floods in urban and rural areas, floods in small and medium-sized river basins, landslides and mudslides; With strong convective weather such as thunderstorms and strong winds, the public is reminded to pay attention to the immediate warning and early warning.

The danger of flooding on citrus

After the citrus is flooded, the first damage is young shoots and young fruit, followed by the incompletely mature new shoots, the third is the peripheral leaves and shoots of the year, and the fourth is the leaves and shoots of the year. Finally, the backbone branches and trunks; the immature leaves of all citrus varieties are sensitive to flooding.

After flooding for less than 6 hours, the leaves are all water-immersed after dewatering, and then rot and dry.

After flooding for less than 12 hours, only a few old leaves of mature branches and leaves are shed, and there are no dead branches. The immature new shoots and leaves are rotted or dried.

After flooding for 12 to 24 hours, most of the old leaves and some mature leaves fall off, and a small amount of 1-2 years old branches die.

When flooded for more than 24 hours, almost all the leaves are deciduous, most of them are dead for 1 to 2 years, and some 3 to 5 years old branches die.

When the fruit is flooded for more than 6 hours, it will be damaged to varying degrees, which will cause the young fruit to fall off and become black on the shoots. The final shedding rate of fruit in water flooding for 24 hours was 40-100%.

These are the result of water flooding causing hypoxia in citrus roots, leaves and fruits. And the above symptoms will show up after a while, and you should pay attention when you didn't find it.

In addition, floods have seriously damaged the basic facilities of citrus gardens such as irrigation and drainage facilities, soil and water conservation facilities, and “pig-marsh-fruit” facilities. At the same time, damage to the road, mountain collapse and landslides directly lead to the destruction of dead trees in the park, causing huge economic losses.

So what should I do?

Timely drainage

Trim and reinforce the drainage ditches system to ensure smooth and smooth flow.

● The water in the citrus garden is shallow, and the channels are dredged in time after the rain to eliminate the water in the orchard.

● For some low-lying citrus orchards, the water is deep, and the ditch is dredged in time, the ditch is drained, and the water in the orchard is removed to reduce the groundwater level and the humidity of the orchard.

● If you can't clean the orchard in time, you should deepen the drainage ditch, make the ditch and ditch communicate, stop the rain and stop the water, prevent the orchard from water, and maintain the maximum aeration of the orchard soil to promote the rapid recovery of fruit trees and prevent disease occurrence. .

Timely cultivating loose soil

After the rain, the soil should be ploughed in time, which is beneficial to improve the photosynthesis and root growth environment of the leaves, improve soil permeability, improve soil aeration conditions, prevent soil compaction, promote root growth, and protect soil moisture and maintain tree body. Water potential.

● When cultivating, increase the depth appropriately, mix the soil and chop the clods. According to the specific conditions of soil and fruit tree growth, it can be cultivated 1 or 2 times.

● For fruit trees with heavy roots due to cockroaches, the roots of the festered trees should be removed, and the white trunks and branches should be brushed with lime water and wrapped with straw or wheat straw to prevent the sun from being exposed and causing cracking of the bark.

Timely disinfection

● After the rain has cleared, it is necessary to clean up the residual scum, debris, etc. on the ground, trunk and branches of the citrus garden in time, and burn it intensively.

● Fruit trees that have been washed down by floods and slanted should be fixed in time and fixed by pillars. The bare roots must be covered with soil.

● Due to the accumulation of sludge in the roots for a long time, the oxygen in the soil will be deficient and some harmful substances will be produced. It is necessary to quickly remove the mud from the surface and spray the residual dirt on the leaves with water to ensure the normal physiological activities of the tree.

Timely topdressing and supplementing tree nutrition

● The root system of the affected fruit tree has a reduced ability to absorb nutrients from the soil, and the fruit tree is weakened. The root dressing should be carried out in time according to the growth of the tree body. The leaf surface can be sprayed with brightly-coated brassinolide + haizisu or Ami. Receive free amino acid or astaxanthin + beauty protection of phosphorus, quickly supplement nutrition, restore the growth potential of the tree as soon as possible, while supplementing the nutrients needed for young fruit expansion.

● Due to the serious damage to the citrus roots after flooding, it can be drained in the water. When the soil is loosened for the second time, the fish protein 800 times liquid is leached to promote rooting and restore the tree potential.

Moderate trimming

● Proper trimming after rain can reduce the water consumption in the upper part of the fruit tree. Trees that have grown too much can be used to properly trim the long branches and the overly dense new shoots. At the same time, some of the long branches are appropriately retracted, and some small fruits are removed to reduce the load of the fruit trees.

● Cut the wound when trimming, and cut off the diseased branches, diseased leaves and diseased fruit caused by rainstorm disaster as soon as possible, and remove it from the garden for deep burial or incineration.

Pest Control

● After the rainstorm, the wind blows the leaves and fruits, scrapes the branches, etc., causing many wounds. In addition, the humidity is high after the rain, and it is very susceptible to infection. It should pay attention to ulcer disease, anthracnose, resin disease, black star disease and red spider. The occurrence of pests such as scale insects.

● It can be used for foliar topdressing and rhizosphere topdressing, together with fungicides such as pyraclostrobin, difenoconazole, ether oxystrobin, carbendazim, captan and other insecticides. .

This article URL: How to prevent pests and diseases by heavy rainfall attacking the southern 2017 citrus cultivation

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