Heavy rains in the south, citrus growers need to pay attention to diseases caused by high temperature and rain

Recently, many areas across the country have entered the "look at the river" and "see the sea" mode, and heavy rainfall is a round of strikes. In recent days, Sichuan, Chongqing and other citrus-producing areas have suffered from floods due to heavy rains, which has made the farmers vulnerable. During the current heavy rainfall process, most of Sichuan Province experienced heavy rains, and Guangyuan, Deyang, Mianyang, Chengdu, Meishan, Ya'an, Neijiang, Ziyang, Suining, Zigong, Zhangzhou, Yibin and other local heavy rains. Neijiang and Mianyang each dropped heavy rains. It can be said that almost all the citrus producing areas in Sichuan have suffered.

On July 1-2, the largest accumulated rainfall appeared in Xilai Town, Pujiang County, Chengdu. The heavy rain caused a large area of ​​citrus in Pujiang County to be flooded. The first two days of Pujiang County is like this: A fruit grower complains: "Don't rain again, you have to play 119 again!"

Orange seedlings washed away by the flood

According to official preliminary statistics, as of 16:00 on the 3rd, heavy rainfall has caused 18020 hectares of affected crops in Sichuan Province, with an area of ​​590 hectares and an area of ​​270 hectares.

After the citrus is flooded, in addition to timely drainage, clearing, sterilizing, and nutritional supplements, the peasant peasant should remind the fruit farmers that in July, the high temperature and high humidity climate will provide a hotbed for many germs, and they will relax a little. Invasion of orchards, which should pay special attention to include citrus canker disease, maculopathy, and anthrax.

Let's take a look at how these three citrus "killers" should distinguish between prevention and control!

Citrus canker

Citrus canker is the second largest quarantine disease. High temperature, high wind and rainy weather are all meteorological conditions conducive to ulcer disease. The main point of prevention and treatment of ulcer disease lies in "prevention, comprehensive management", and special attention should be paid to medication and management before and after the storm.

Control measures: 1. The preferred inorganic copper for drug use, such as copper hydroxide, spring copper, cuprous oxide, etc.; mild occurrence can be considered organic copper, antibiotics. 2. Cut off the diseased leaves and clean up the orchard. Examples of prevention and treatment, heavy cut (Wogan) ulcers with good drug control, autumn and winter disease leaves are easy to fall off, to be cleaned, pay attention to avoid scissors to cut the leaves and infection.

Lipid maculopathy

Citrus fat spot yellow spot disease, also known as maculopathy and lipoplasia, is a common disease in citrus, mainly infesting young shoots and fruits. According to different infection periods, parts and symptoms, it can be divided into the following types: lipid spot yellow spot type, brown small round star type, mixed type and so on.

The occurrence of maculopathy is closely related to rainfall. The more rainfall, the higher the disease growth rate. When weather conditions such as continuous rainfall and floods occur, the incidence is serious. Citrus trees caused by freezing, sunburn, mechanical damage, insect damage, etc. can create conditions for the epidemic of the disease.

Prevention:

1. Remove stagnant water from the orchard, improve soil permeability, and destroy the breeding conditions of the source.

2. Strengthen cultivation management. Wash the leaves, spray the bio-stimulant on the foliage to quickly increase the tree potential; when the topsoil is no longer sticky, combine the cultivator, apply a bio-stimulant, promote rooting, enhance the resistance to stress; Diseased branches, diseased leaves and diseased fruits reduce the water consumption of the orchard and help improve the permeability of the orchard and infect the low pathogen.

3. Cooperate with chemical control. Selecting a drug with strong systemic or film-forming properties for prevention and control, the drug may be selected from pyraclostrobin and difenoconazole. The disease has been selected to be selected from the group consisting of benzomethazol + mancozeb, bismuth tebuconazole + mancozeb, pyraclostrobin + mancozeb, etc.

anthrax

Anthrax has a wide range of hazards, a long period of infection, and is latent and difficult to control. When it occurs seriously, it can cause a lot of fallen leaves, dead ends, dead fruits, and fruit drop, which leads to the weakening of the tree and the sharp drop in output. The spring shoots begin to develop in the late stage, and the summer and autumn shoots are prosperous. Wounds and sunburned fruits are susceptible to illness, and orchards that are severely affected by other pests and diseases are more severe.

Control measures: effective agents include azoxystrobin, prochloraz, prochloraz, manganese, zinc, mancozeb, difenoconazole, etc. and their compounding agents, pay attention to rotation, be sure to pay attention when spraying Evenly, it is the standard for spraying wet leaves without dripping. (Agricultural Assistant, Li Nong Citrus Technology, Sichuan Online)

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