Apple scab prevention and control methods, what are the specific drugs for apple scab?

What kind of disease is apple scab? Why is the ecology of the disease? What are the prevention and control methods?

Symptoms: damage to leaves and fruits. At first, olive irregular round spots appeared on the back of the leaves, and then they became gray-black, sometimes with black metal luster, and the leaf tissue was gradually destroyed. Generally, the injured leaves became smaller, deformed, slightly curled, and early defoliation. The disease spot on the fruit is round, there are gray-green villi in the initial stage, the black matter is conidia, the disease spot is dark brown in the later stage, the epidermis is cracked and corked, it is scab-like, and the fruit is deformed. The early sick fruit is easy to fall.

Disease ecology: when the temperature is 15-20 ℃ and continuous rainfall, the disease is serious. The sexual generation of this pathogen has not been found in Taiwan, and it may overwinter as hyphae latent buds or in withered branches and leaves. The conidia produced on the leaves (olive green villous appearance) are the main transmission and infection organs, which can be circularly infected.

Prevention and control methods:

40% McKenny wettable powder

Spraying began at the initial stage of the disease, once every ten days until mid-July. Stop using medicine 6 days before harvest.

30% Saifu seat wettable powder

At the initial stage of the disease, the drug was sprayed every 10 days for four to six times. 1. When this medicine is tested, the developing agent Rabiden-SS is 3000 times. two。 Stop spraying 12 days before harvest.

65% Dorning wettable powder:

1. Once a week after sprouting.

two。 The flowers were applied every 10 days until mid-August.

1. Add 3000 times the developing agent to the solution to prevent Rain Water from scouring and reduce the efficacy of the drug.

two。 In case of continuous overcast and rain, the number of times of application should be increased.

3. Do not apply pesticide during flowering.

The application of pesticide was stopped 4 days before harvest.

70% methyl zinc Naipu wettable powder

The application of pesticide was stopped 4 days before harvest.

70% Jiaduojing wettable powder

1. Once a week after sprouting.

two。 The flowers were applied every 10 days until mid-August.

1. Add 3000 times the adhesive to the solution to prevent Rain Water from scouring and reduce the efficacy.

two。 In case of continuous overcast and rain, the number of times of application should be increased.

3. Do not apply pesticide during flowering.

4. In order to avoid drug resistance of this pathogen, it should be used in turn with other agents.

50% Ryder wettable powder

1. Once a week after sprouting.

two。 The flowers were applied every 10 days until mid-August.

50% free wettable powder mixed with 7e Sunspray oil

Add 25g + 250ml 4000 per 100L of water and apply it every 10 days

1. Add 3000 times the adhesive to the solution to prevent Rain Water from scouring and reduce the efficacy.

two。 In case of continuous overcast and rain, the number of times of application should be increased.

3. Do not apply pesticide during flowering.

4. In order to avoid drug resistance of this pathogen, it should be used in turn with other agents.

50% free wettable powder mixed with 7e Sunspray oil

Add 25g + 250g 2000 per 100L of water and apply it every 20 days

1. Add 3000 times the adhesive to the solution to prevent Rain Water from scouring and reduce the efficacy.

two。 In case of continuous overcast and rain, the number of times of application should be increased.

3. Do not apply pesticide during flowering.

4. In order to avoid drug resistance of this pathogen, it should be used in turn with other agents.

50% Ryder wettable powder mixed with 30% Guoning solution

Add 25g + 125g 4000 per 100L of water and apply it every 10 days

70% methyl duobaojing wettable powder mixed with 30% Guoning solution

Add 33.3g + 125g 3000 per 100L of water and apply it every 10 days.

11.76% Fenrimo Emulsion (Fenarimol)

The drug was applied at the initial stage of the disease, once every 10 days, for eight consecutive times.

1. When this medicine is tested, add "full penetration force" 1000 times or "come out" 2000 times.

two。 Stop taking medicine 5 days before harvest.

12% fenrimo wettable powder

The drug was applied at the initial stage of the disease, once every 10 days, for eight consecutive times.