Detailed Explanation of Key Points of Virus-Free Fruit Tree Planting Technology

Mix 1 bag of Qinongsu (10 g), 1 bag of 72% agricultural streptomycin (15 g), and 15 g of copper sulfate. Add 2 liang of edible vinegar to foam and dissolve, then add 30 jin of water and spray or drench the roots. (Referred to as agricultural streptomycin-copper sulfate mixed solution.) Adding 20 g of zinc sulfate (zinc fertilizer) and 20 g of boric acid (boron fertilizer) (40 g for root drenching) is even better. Among these, for peach, plum, apricot (mei) and cherry, use 15 g of copper sulfate before leaf expansion, and do not use copper sulfate after leaf expansion. For peach, plum, apricot (mei) and cherry, use 20 g of boric acid before leaf expansion and 10 g after leaf expansion.

I. Spraying: 1. Spray 1-2 times from flower bud break to petal-fall stage. The pest control effect is good; do not add insecticide during full bloom, so as not to kill the pollinating bees and affect pollination and fertilization. If the number of flowers is small and weak, add 0.5-1 g of gibberellic acid to the mixed solution, which has an remarkable effect on enhancing flower production and pollination and fertilization. Pay attention to flower and fruit thinning. 2. During the small, medium and large fruit stages, use 1 bag of Qinongsu (10 g), 40 g of zinc sulfate, 50 g of lime, add 2 liang of vinegar, stir, add 2-3 jin of water, to make chelated zinc-calcium. Add the thick paste to the No. 3 agricultural streptomycin-copper sulfate mixed solution, and spray once each at the small fruit, medium fruit and large fruit stages, to supplement calcium, significantly prevent fruit cracking, fruit brown rot and rotten fruit, strengthen the control of various diseases and pests, and make the fruit glossy and shiny. 3. For peach, plum, apricot, mei and cherry after leaf expansion, do not use copper sulfate in the mixed solution, use 10 g of boric acid (boron fertilizer), add 2-3 jin of chelated zinc-calcium, and spray once each at the small, medium and large fruit stages.

II. Root drenching: Add 50 g of ferrous sulfate to the agricultural streptomycin-copper sulfate mixed solution, and drench the roots once each from flower bud break to petal-fall stage and at the medium-large fruit stage. Among these, at the medium-large fruit-setting stage, because too many fruits are set, too large and too heavy, root drenching must be done once to prevent fruit drop, with an remarkable effect on supplementing nutrition. It prevents and controls yellowing disease of various fruit trees and significantly increases chlorophyll, including for citrus in preventing and controlling huanglongbing, mainly by root drenching. In 7 days yellow leaves turn light green, and in 25 days they can change from yellow to dark green.

III. It can prevent and control viral and viral diseases (continuous cropping, premature aging, stunting, mosaic, leaf curl, yellow leaf, broken leaf, small leaf, bark cracking, fruit cracking, fruit shrinkage, huanglongbing, jujube witches' broom, hualian, rusty fruit, persimmon witches' broom and pox disease, etc.), bacterial diseases (crown gall, citrus canker, angular leaf spot, etc.), fungal diseases (root rot, trunk rot, dieback, ring rot, scab, anthracnose, black spot, brown rot, gray mold, black spot, powdery mildew, downy mildew, rust, sooty mold, banana Panama disease, etc.), and comprehensive diseases (gummosis, apple moldy core, etc.). It amazingly increases fruit yield, quality and sugar content.

IV. Prevention and control of various pests: In the agricultural streptomycin-copper sulfate mixed solution, add 1-2 vials of 20% Mie Saoli (fenpropathrin) (each vial 4 ml) and 1-2 bags of 10% imidacloprid (each bag 10 g), add 30 jin of water, and spray 1-2 times within 1-3 days. If the pest infestation is severe, double the amount of insecticide. One spraying can keep the tree free of pests for several months (half a year).