<h2 class= "title" > how to use the pear tree should be determined according to the pest and disease and growth period. </h2>
1. Dormancy period
Combine pruning to remove diseased and insect shoots, sweep the fallen leaves and fruits, and scrape the old warp on the main branch trunk. The above measures have a certain control effect on hawthorn leaf mites, star caterpillars, pear heartworms, pear small heartworms, pear aphids, mealworms, black star disease, etc. The trunk is white to prevent frost damage, and the trunk coating formula is 10 parts of quicklime, 2 parts of stone sulfur compound, 1 part of table salt, a little oil, and 30 parts of water.
February and March (before buds)
(1) Branch disease (rot disease, dry rot disease, rot disease): after timely scraping of the scar, the decay must be cleared 3 times, the 5% bacterial poison clear water agent 50 times or the 2.12% 843 rehabilitation agent 10 times, applied every 30 days, a total of 3 times.
(2) Prevent sunburn: the trunk is whitened, and the recipe is the same as above.
(3) Diseases and insect pests (black spot disease, rotunda disease, leaf mites, mesenchymals, yellow mealybugs): spray 5 degree stone sulfur compound.
(4) Pear lice: grasp the early prevention and control of overwintering adults and first-generation eggs before pear lice flowers, which can control the harm throughout the year. After stinging: Spray 1.8% avermectin 5000 times or 20% cypermethrin emulsion 2000 times twice on the tree, with an interval of 15 to 20 days.
March and April
(1) Pear star caterpillar, pear heartworm, canopy caterpillar: flower bud expansion stage, spray on the tree 25% urea no. 3 1500 times, 20% rapid killing butadiene emulsion, 2.5% kung fu permethrin emulsion, 2.5% cypermethrin emulsion and other 2000 times.
(2) Pear real bee: before flowering, spray the above insecticide on the tree; during the separation period of the pear blossom inflorescence, the ground is sprayed with 25% octylthion microcapsulant water agent 300 times, mixed soil.
(3) Pear stem bees: Gurdjieff's pear stem bees occur in 1 generation per year, and adults begin to feather after falling flowers every year, pear stem bees occur in 1 generation every two years, and the full flowering period of odd-numbered years begins to feather, 8 days earlier than The Gurdjieff pear stem bees. In odd-numbered years, at the initial emergence (full blooming) of pear tree new shoots, the yellow double-sided armyworm board is suspended on a 2-3 year old branch 1.5 to 2 m high, and the plate surface is straight in an east-west direction. Generally, 8 pieces are hung every 666.7m, and they can be evenly distributed in the pear orchard. Each year, the pear stem bee sprays 20% cypermethrin emulsion or 2.5% cypermethrin emulsion 3,000 times on the tree after falling flowers.
(4) Pear dipterophyllum: before flowering, all overwintering eggs hatch without causing leaf curling when spraying control, once a year can be used to control the harm. l0% imidacloprid 3000 times, 10% aphid net wettable powder 6000 times, 2.5% flutter aphid wettable powder 2000 times. (5) Scarab beetle: pear tree budding, leaf spreading period, spray 48% Lesben 500 ~ 800 times liquid under the tree, after the flower, canopy spray, 50% octyl thiophosphorus emulsion 1000 times liquid or 2.5% enemy killing emulsion 2000 ~ 3000 times, afternoon to dusk is better.
4. 7 days after the flowers fall
(1) Black star disease: 40% fuxing 8000 to 10000 times, 70% methyl tolbuzin 1000 times or 75% carbendazim 800 times;
(2) Black spot disease: 800 times agricultural resistance 120, 1.5% polyantimycin 500 times or 10% polyoxymycin 1500 times;
(3) Pear lice: 1.8% avermectin 5000 times, l0% imidacloprid 3000 times plus washing 1000 times or silicone surfactant 2000 times. Spray the above agents twice, with an interval of 15 days, pay attention to the alternating use of the agents.
May, May
(1) Red star disease: within 25 days after the budding of the pear tree to the spread of leaves, 25% triazolidone (powder rust) 3000 ~ 4000 times liquid;
(2) Tea wing bugs: in late May, they gradually entered the pear orchard, artificially hunted or sprayed on trees with 2.5% cypermethrin emulsion 3,000 times.
(3) Pear stem bee, Gurdjieff pear stem bee: cut off the dead branches in time.
(4) Yellow mealybug: l0% imidacloprid 3000 times (spray a fungicide before the pear bagging, can be mixed with insecticides, plus 70% methyl tolbucin 1000 times or 40% Fuxing 8000 ~ 10000 times).
(5) Pear roundworm: A generation of nymphs hatched in full bloom (mid-to-late May acacia tree flowering period) timely spraying. 25% chlorpyridoxine wettable powder 1000 times, 40% dipter gram 800 times, quick flutter 800 times 2 or 3 times, plus 1000 times washing spirit or add silicone surfactant 2000 times.
June, June
(1) Black star disease, black spot disease, rotisis, etc.: spray protective agent 1:3:240 Type Bordeaux liquid twice on sunny days, with an interval of 15 to 20 days.
(2) Tea wing bugs: About June 5, the nymphs in the first incubation period of tea wing bugs were timely controlled, and 5% cypermethrin emulsion was 1000 times and 2.5% cypermethrin emulsion was 3000 times.
(3) Yellow mealybug: From early to late June, the yellow mealybug fruit transfer into the bag is the peak of harm, and the l0% imidacloprid is sprayed again 3000 times.
(4) Hawthorn leaf mite (hawthorn red spider): Before and after wheat harvest is the peak period of overwintering adult mites and the first generation of egg hatching, prevention and control twice. Prevention and control indicators: 2 leaves per head, 15% pyridoxine emulsion 2000 to 3000 times, 5% nissolan emulsion 2000 times, 25% triazoltin can be 15% emulsion 2000 times plus silicone surfactant 2000 times.
July, July
Continue to control pear tree diseases: spray protective agent 1:3:240 Bordeaux liquid 1 to 2 times on sunny days, with an interval of 15 to 20 days.
Spray fungicides on trees during the rainy season:
(1) Black star disease: 10% of the world's higher than 5000 times.
(2) Black spot disease: 1.5% polyantimycin 500 times or 50% parahynthene 1500 times.
(3) Rotavirus disease: 75% bacillus clear 800 times.
(4) Pear small heartworm control methods: (1) fruit bagging. (2) During the adult occurrence period, use a pear small sex trap to trap the adult insects, and trap every 50 trees to hang a trap. (3) Monitoring, reporting that the whole garden hangs 3 traps, which are hung in the peach orchard before July, and hung in the pear orchard in the later stage. The use of insect exohormonal cores for detection and reporting is simple and easy to perform, and the sensitivity is high. The commercially available rubber head is used as a carrier of sexual core, suspended above a basin with a diameter of about 20 cm, the core is 2 cm from the water surface, and the basin is filled with water and a little washing powder. The water basin trap is then hung in the orchard, 1.5 meters above the ground. Since early April, the peak of moths (adults) can be counted by recording the number of male moths in the pot daily or every other day. Generally, 1 to 3 days after the peak of the moth, it is the beginning of the egg peak, and spraying is arranged immediately. (4) Spray 25% of urea during the peak period of moths to kill 1500 to 2000 times. Pear small heartworm insect sex core Chinese Academy of Sciences animals are sold, or purchased at the local plant protection station.
August, August
In late August, pear small heartworms still have a peak of borer fruit, and 1 to 3 days after the peak period of adult insects are detected with pear small sex attractants or 1 to 3 days after the peak period of pear small sex attractants, spray 25% urea no. 3 1500 times liquid.
