Detailed Explanation of Pest and Disease Control Methods for Apple Trees at Different Growth Stages

What pests and diseases affect apple trees at different growth stages? What are the control methods? Below, the Tutuliu editor provides a detailed explanation for everyone

1. March to early April (before bud break)

Pay attention to apple tree valsa canker, branch and trunk ring rot, dry rot, overwintering pests, and spider mites. In combination with pruning, scrape off valsa canker scars, ring rot tumors, and rough bark, prune off dead branches infected with dry rot, scrape off old rough bark on the trunk and hidden overwintering pests, and carry them out of the orchard to burn. After scraping or scoring, apply 40x Junduqing or Haorun 50x to the diseased scars, and spray the whole tree with 3 to 5 degrees lime sulfur mixture, or 21% peroxyacetic acid 200x, or 43% Haolike 1000x, and other pesticides.

2. Mid to late April (before flowering)

Pay attention to diseases such as powdery mildew, leaf-feeding pests, and aphids. Spray 70% propineb 700x, Zhixin high boron 1500x, 2.5% deltamethrin 2000x, or 40% closed petroleum oil emulsion 400x.

3. Late April to early May (flowering period)

Pay attention to controlling moldy core and Japanese beetles. Spray 70% propineb 700x, 70% thiophanate-methyl 1000x, Zhixin high boron 1500x, 2.5% cyhalothrin 2000x. For orchards with severe Japanese beetle infestation, chemical control and manual control can be combined, or frequency-vibration insect-killing lamps can be used to trap and kill adults.

4. Mid to late May (7 to 10 days after petal fall)

Pay attention to controlling ring rot fruit rot, moldy core, early leaf defoliation disease, bitter pit, spider mites, leaf-curling aphids, yellow aphids, cotton aphids, and caterpillars. Spray 70% propineb 700x, 24% spirodiclofen 4000x (if adult mite population is high, add 1.8% abamectin 4000x), 2.5% deltamethrin 2000x, Zhixin high calcium 1500x. For high cotton aphid populations, spray 30% chlorpyrifos emulsifiable concentrate 1500x.

5. Early June (20 days after petal fall)

Pay attention to controlling fruit rot, black spot disease, bitter pit, and leaf diseases, as well as the emerged larvae of the peach fruit moth. Choose 80% mancozeb 600x, or 70% thiophanate-methyl 1000x, 2.5% deltamethrin 2000x, Zhixin high calcium 1500x. According to monitoring and forecasting, when male moths are continuously trapped, spray the ground under the canopy with 48% chlorpyrifos 500x. Pay attention to supplementary application of calcium fertilizer to the soil.

6. Late June (young fruit stage)

Mainly control ring rot fruit rot, leaf diseases and bitter pit, golden leaf miner, yellow aphids, and spider mites. Choose 70% propineb 700x, 80% mancozeb 600x, 70% thiophanate-methyl 1000x, 80% carbendazim 800x, Zhixin high calcium 1500x. Spray 0.5% emamectin benzoate 1500x or 25% diflubenzuron No. 3 2000x mixed with 10% imidacloprid 3000x or 3% acetamiprid 2000x.

7. July

1. Early July: control fruit rot, alternaria leaf spot disease, peach fruit moth, leaf roller, and other pests. Choose excess Bordeaux mixture 200x or 70% Bordeaux powder 800x. According to monitoring and forecasting, when the egg fruit rate reaches 1%, carry out on-tree control with 2.5% deltamethrin 2000x or 4.5% beta-cypermethrin 2000x.

2. Mid to late July: continue controlling fruit rot and leaf diseases, leaf rollers, and spider mites. Spray excess Bordeaux mixture 200x or 70% Bordeaux powder 800x, 24% spirodiclofen 4000x mixed with 1.8% abamectin 3000x (spirodiclofen does not easily decompose when exposed to alkali, and its effective period can reach more than 45 days).

8. August

1. Early August: pay attention to diseases such as fruit rot, golden leaf miner, leaf rollers, and two-spotted spider mites. Spray 43% tebuconazole 6000x, 70% propineb 700x, 2.5% deltamethrin 2000x, 5% triflumuron 2000x, and other pesticides. For severe two-spotted spider mite infestation, use a compound preparation of clofentezine and abamectin for control (if acaricide is sprayed in mid to late July, no spider mites will occur). Pay attention to supplementing phosphorus, potassium, boron, and calcium.

2. Late August: pay attention to diseases such as fruit rot, sooty blotch, and flyspeck. Apply 70% thiophanate-methyl 1000x or 70% propineb 700x solution, 1% emamectin benzoate 2000x.

9. Before fruit harvest (after removing bags from bagged fruit)

Pay attention to diseases such as fruit rot, sooty blotch, flyspeck, and bitter pit. Spray 43% tebuconazole 4000x, Zhixin Guosheng 1000x, Zhixin high calcium 1500x (Note: it is best not to use powder-form pesticides before harvest to avoid contaminating the fruit surface).

10. After fruit harvest

Control various overwintering pests and diseases, promptly clean the orchard, and remove dead branches and fallen leaves. Whitewash the tree trunks, deep-plow the orchard, cover with grass, and irrigate.