Apple Pear After Flower Selection

First, the right medicine, targeted.

The major diseases of apple after flowering are: powdery mildew, spotted deciduous disease, brown spot disease, rotenus rot disease, anthracnose. The main insect pests are: Astragalus, gold-grained moth, leaf roller moth, and red spider.

The main diseases after falling pears are: black spot and black spot. Insect pests include pear-eating bees, pear-stalk bees, pear-tree worms, and yellow-yellow-flies.

After the spring, with the increase of temperature, germs and pests began to move. If it encounters a rainy day, the spore plate or ascus shell of the bacteria breaks after swelling and absorbs a large amount of spores in the air. The spores of these pathogens will splash with the flow of air or rain, and zoospores will adhere to the surface of fruits and leaves and invade from the stomata. At this time, the bacteria will immediately infect the plants. After the infection, the pathogen first lurks in the fruit or leaves for a period of time, and the incubation period for different diseases is different: for example, the brown spot is 6 to 12 days, the rotenus rot disease is 15 to 150 days, and the spotted defoliation disease is 3 to 6 hours.

Both spot deciduous disease and brown spot disease can cause early loss of apple leaves, and the major defoliation of Red Fuji varieties is brown spot disease. The pear scab can not only cause the leaves of the pear tree to fall off, but also can make the fruit lose its food value. Therefore, the prevention of diseases is more important than insect pests.

Second, the type of fungicide is selected for the role of the bactericide.

The characteristics of protective fungicides: 1. A uniform and dense protective film is formed on the surfaces of fruits and leaves, which effectively prevents the contact between pathogens and fruits and leaves. 2. Inhibit the germination of zoospores and kill zoospores. 3, the role of pathogenic bacteria targets more. 4, continuous use will not produce resistance. It is mainly used before or at the beginning of the disease.

The characteristics of systemic therapeutic agents: 1. Systemic therapeutic agents are absorbed by plants in fruits and leaves and participate in fluid flow in plants. 2. The systemic fungicide mainly inhibits or destroys the formation of pathogenic mycelium and controls the spread and spread of the disease. 3. Single point of action for pathogenic bacteria targets, and continuous use will induce resistance to the drug. Generally used after the onset of fruit trees.

Third, we must consider the safety of pharmaceuticals on young fruit.

The fruits of apples and pears are more sensitive to chemical agents in the young fruit period. If they are used improperly, they will cause enlargement of fruit spots and thicker peels. In severe cases, fruit rust or invisible phytotoxicity will occur, causing the fruit to lose its food value. Therefore, copper preparations, sulfur preparations, fungicides, synergists, penetrants, and unsafe dosage forms that may cause phytotoxicity to young fruit are not used as much as possible in young fruit. Try to choose safe formulations for young fruit such as: liquid suspensions, water dispersible granules, soluble powders, liquids, and good quality wettable powders.

Fourth, consider the cost of medication and maximize the efficacy.

The unclean water used during the application will have a certain impact on the efficacy of the drug. At the same time, due to the waxiness and hairiness on the surface of the fruit and leaves, the poor infiltration and coverage of the drug will affect the control effect. The addition of Roushuitong will not only improve the water quality and increase the efficacy, but also reduce the amount of liquid spray, thus reducing the cost of application. In addition, the selection of a protective bactericide with a long effective period of time will also reduce the cost of control.

Through the analysis of the above factors, apple and pear fungicide should be selected after the fall of the fungicide, we recommend the following formula to the fruit farmer:

1,40% fruity suspension concentrate plus 42% spew Fulu or 43% Dashengfu 800x or 65% Putkejin 800x plus 20% Anmite or 20% good winter 1500x 40% good labor or 40% safety Folk music 1500-2000 times plus water 4,000 times.

2, the second time after the beginning of flowering medication, you need to add 600-800 times the calcium lactate solution, the load of tree weakness when the tree spray can add fruit friends amino acid (barrel bottle can be) 300 times.

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