Lemon can be fruitful only if it is managed scientifically.

Summer is the period of young fruit expansion, summer shoot sprouting and physiological fruit drop, which is the key season to ensure lemon yield and improve lemon quality. The management techniques of lemon in summer mainly include the following aspects:

I. soil, fertilizer and water management

1. Water management. As there are many Rain Water in summer, the high temperature continues, and the humidity of the orchard is too high, the orchard drainage should be strengthened in time, and the drainage ditch and back ditch should be arranged in time. The depth of the drainage ditch depends on the position of the soil. The depth of the gully is 70-80cm, the width is 60cm, the depth of the first and second trenches is about 40cm, and the width of the ditch is about 30cm. In case of drought, when the soil water content is less than 60%, it should be irrigated immediately to ensure an adequate water supply in the young fruit stage. if the water source is insufficient, water-saving hole irrigation can be used, and straw and straw can be used to cover the tree plate to increase moisture and cool down.

2. Apply strong fruit fertilizer. According to the weather conditions to determine the fertilization time, according to the soil fertility and tree potential to determine whether to increase or decrease the amount of fertilizer application.

When applied from late June to July 20, the special fertilizer of lemon 2 kg + human and animal manure 80-100kg/ was applied to the plants within the 25kg of the current year, and the special fertilizer 0.5kg was applied when the yield was increased by 10kg.

Second, summer pruning

For the adult fruiting trees, one is to wipe off the summer shoots in time to avoid competing with the fruit for nutrients and reduce the secondary physiological fruit drop; the other is to cut off the weak branches, disease and insect branches, dense branches and long branches to ensure the ventilation and light inside the tree; to appropriately re-cut some old and weak trees with little fruit in front of the Summer Solstice and strengthen fertilizer and water management; to coring young trees to promote crown expansion and trunk shaping.

III. Disease and pest control

In summer, the main diseases and pests of lemon are red and yellow spider, sagittal scale, rust wall lice, anthrax, scab and so on.

1. Red and yellow spiders

Red and yellow spiders mainly harm leaves, red spiders make damaged leaves produce gray-white dots, and in serious cases, the whole piece of gray-white, and cause fallen leaves; yellow spiders make damaged leaves appear large maculae protruding to the leaf surface on both sides of the main vein and between the main vein and the branch vein, and can lead to leaf deformity or shedding. The harm is serious, so prevention and control should be done well.

Control agents: ① 24% acaroid EC 4000 Mel 6000 times (can only be used once a year), ② 20% acarazine EC 2000 Mel 3000 times, ③ 5% Nisolang EC 1000 Mel 1500 times, ④ 20% Tetramites EC 2000 times, ⑤ 0.3% azadirachtin EC 1000 Mel 1500 times, ⑥ 45% crystal stone sulfur mixture 250400 times.

Any of the above agents can be evenly sprayed with water.

2. Lemon sagittal scale

Lemon sagittal scale harms the leaves and shoots of lemon trees, resulting in yellowing and shedding of leaves, withering branches in serious cases, causing yellow spots on fruits and affecting the appearance quality of fruits. When there are damaged dead branches, they should be cut off in time and burned centrally. Pick and treat the less harmful orchards to prevent and cure the seriously harmful orchards. Very heavy can be prevented and treated continuously for 2 times for 3 times. The suitable period for the first control is May 17-20, the second is from May 29 to June 1, and the third is from June 13 to 18.

Control agents: ① 3% annual EC 1500 Mel 2000 times; ② 0.5% Fruit San San EC 800Mel 1000 times; ③ 48% Lesbon EC 1500 times; ④ 40% Giu Lei 1000-1500 times; ⑤ 0.5 pomethyl sulphur mixture spray (used in June); ⑥ 25% propofol wettable powder 1500 times 2000 times.

The above agents can be evenly sprayed with water by adding a new high-fat membrane.

3. Lemon rust tick: it is mainly harmful to lemon leaves and fruits, resulting in gray fruit or black fruit, the appropriate period for control. From June to August, strengthen the inspection of the lemon orchard, when a gray fruit (a newly damaged leaf of black fruit or rust tick lice) is found in the whole orchard, immediately apply pesticide to control.

Control agents: ① 10% benzoin suspension 1500mur2000 times solution; ② 20% acaridin EC 2000mur3000 times solution; ③ 20% tetramite 2000 times solution; ④ 0.5 Baomei stone sulfur mixture.

The above agents can be prevented by adding a new high-fat membrane with water.

4. Lemon anthracnose and scab

In the case of more Rain Water, it is easy to induce anthrax and scab to cause fruit drop. In summer, we should pay attention to drainage to reduce the humidity in the field, pick out the fallen fruit in the garden and burn it centrally to reduce the base number of pathogens, and do a good job in the drug control of anthracnose and scab, combined with the application of insecticides to control the disease at the same time, the application interval of 10rel for 15 days, continuous application of 3rel for 4 times, and the alternate use of pesticides.

Prevention and treatment agents: ① 10% Shigao Water dispersible granule 3000 times (treatment agent); ② 18% Bao Zhida EC 800 1000 times (treatment agent); ③ Tree Protection General; ④ 25% Shibaoke EC 1000 times (treatment agent); ⑤ 12% nitrilazole 2000 times solution (treatment agent); ⑥ 70% methyl thiophanate wettable powder 600 times solution (treatment agent); ⑦ 80% Dasheng Mrel 45 wettable powder 600 times solution (protective agent) ⑧ 80% mancozeb wettable powder 600x liquid (protective agent); ⑨ 0.5pomelite sulfur mixture (used after mid-June).

Choose one of the above chemicals for prevention and control with water.

Fourth, lemon bagging technology

1. Bagging time: lemon spring fruit should be bagged from the end of June to mid-July, summer flower fruit should be bagged from August to September, and the growth time of lemon fruit after bagging should be guaranteed for 70ml for 90 days.

2. The choice of bagging fruit: select the fruit with good disease and pest control, smooth fruit surface, good fruit shape, no disease and insect class, fruit diameter about 35mm bagging fruit.

3, the choice of paper cover: choose an opaque wood pulp paper bag of 50 grams of tissue paper and 40 grams of inner paper, it is required to have good moisture resistance, tensile resistance, permeability, non-immersion with alcohol on the surface, rubbing in water, non-diffusion of dripping water on the surface, and pre-buried thread. There is no trachoma from the inside to the outside with the naked eye after putting the fist into the fruit bag.

4. The method of bagging: "one support, two sets, three sets and four twists": first open the paper bag with a fist, and then cover a paper bag with a fruit, and place the fruit in the middle of the bag, the mouth of the bag is flat * in the handle, close the mouth of the bag, and seal the handle with the silk pre-buried on the edge of the bag.

5. Matters needing attention for bagging: 2 days before bagging, insecticides and fungicides are sprayed evenly and thoroughly on the tree body and fruit surface, and the bags can be bagged after the fruit is dried. If stone-sulfur mixture is applied, it should be bagged 7 days after the application of 5Mui to avoid fruit burns. Can not be covered without pesticide, poor disease and pest control can not be set, potion can not be covered before drying, dew can not be covered, rainy days can not be covered, noon high temperature can not be bagged, paper bags should be sealed downward, timely irrigation and straw mulching should be done in case of drought after bagging.