Spring flower pest and disease control should not be overlooked
Spring is a big season for flower growth and transplanting, but during this period flowers can also develop various diseases. A reminder from the editor: while fertilizing flowers reasonably and doing shaping and pruning, you should also pay attention to pest and disease control.
Chinese rose
As temperatures rise and the tender buds of flowers and trees grow, various pests and diseases of flowers and trees follow. As a grower, you should inspect flowers and trees at any time and treat them according to the symptoms. At present, the main chemical pesticides used for pest and disease control are: 40% omethoate at 1000 times dilution for aphids, pyrethroids (such as 2.5% decis and 20% sumicidin) at 2000 times dilution for butterflies and moths of the order Lepidoptera, 20% dicofol at 800 times dilution for mites, and 40% omethoate at 1000 times dilution for scale insects. However, the control timing must be grasped at the peak hatching period of the first-generation young scales; mid-May to early June is the critical period. Once the young scales have formed a protective waxy shell, control with ordinary pesticides generally becomes very difficult. For disease control, prevention is more important than treatment. For those flower and tree varieties that are prone to disease, inspect them frequently. Once a small number of lesions appear, promptly spray for control. However, some diseases have pathogens that already invade as early as the bud stage; for these diseases, spray for control as early as possible. Generally, 70% thiophanate-methyl at 700 times dilution or 50% carbendazim at 500 times dilution can be used, spraying once every 7 days for 2 to 3 consecutive times for integrated control.
Spring household flower pest and disease control: common spring flower pests and diseases
In spring, flowers have relatively many pests and diseases, with damage being more serious in April and May. Common spring flower pests and diseases include powdery mildew, rust, and black spot. Below we share spring household flower pest and disease control. In order to grow your flowers well, take a look.
General methods for spring household flower pest and disease control:
1. Keep the cultivation area for flowers clean and hygienic, which can reduce damage.
2. Protect the plants; do not let the skin break or become damaged, and beware of pathogen invasion.
3. Disinfect the growing medium in advance, which can kill pathogens and pests.
4. Strengthen daily management, keep water and fertilizer appropriate, air circulation good, temperature suitable, and light moderate, so that the plants grow robustly and the breeding and spread of pests and diseases are controlled.
Spring household flower pest and disease control
The following introduces the specific control of related pests:
1. Aphids
Aphids (honeydew insects): Hibiscus syriacus, ornamental peach, Chinese hibiscus, Chinese rose, and Japanese honeysuckle are all easily harmed by aphids. As temperatures rise, aphids also increase day by day and must be controlled.
Control methods: 1. Spray 40% omethoate or 50% phosmet after diluting with water 1200-1500 times.
2. For a small number of potted flowers, you can also spray a 70-100 times dilution of neutral laundry detergent solution.
2. Red spider mites
Red spider mites: jasmine, Chinese hibiscus, asparagus fern, Chinese rose, and dahlia, among others, begin to cause damage from early April.
Control methods: For a small number of potted flowers, frequently rinse the front and back of the leaves with tap water, or spray or dab with boiled and cooled 100-150 times diluted flour paste water, then rinse once more with clean water after one or two days, which can achieve obvious results.
3. Scale insects
Scale insects (flower lice): scale insects on white magnolia, Chinese rose, boxwood, and pittosporum mostly begin hatching from mid-April to mid-to-late May.
Control methods: 1. Before they hatch, gently brush off the insects by hand.
2. Check frequently, and during the larval hatching period spray 40% omethoate at 1000-1500 times dilution.
4. Damping-off
Damping-off: When the temperature reaches 20°C, newly sown flowers, saplings, and some flowers prone to root rot are highly susceptible to damping-off when soil moisture is high.
Control methods: 1. Before sowing, evenly mix 1.5-4 kg of 70% quintozene per mu into the soil.
2. Control watering during the tender seedling stage, and do not make the soil too wet.
3. When diseased seedlings are first found, irrigate with 1% ferrous sulfate or 200-400 times diluted 50% amobam solution, applying 2-4 kg of the solution per sq m.
5. Rust
Rust: crabapple rust easily infests flowers and trees in large amounts after rain in April and May, and rose rust infests when rose buds are about to open.
Control methods: 1. When roses sprout, promptly pick off and burn the yellow diseased buds that sprout first, eliminating the source of infection.
2. During the initial infection period, spray 15% triadimefon at 700-1000 times dilution.
6. Powdery mildew
Powdery mildew: Chinese rose powdery mildew, and garden balsam and smoke tree powdery mildew mostly occur in May and June, and in summer easily cause symptoms such as yellow leaves, withered leaves, and curved tender shoots.
Control methods: 1. Pay attention to ventilation and light transmission for the flowers.
2. Apply less nitrogen fertilizer and more phosphorus and potassium fertilizer.
3. Spraying 15% triadimefon at 700-1000 times dilution once during the initial infection period is sufficient.
Control of main spring flower pests and diseases
When spring arrives, various flowers have relatively many pests and diseases. The following are generally the more serious ones:
Aphids (honeydew insects):Hibiscus syriacus, ornamental peach, Chinese hibiscus, Chinese rose, and Japanese honeysuckle are all easily harmed by aphids. As temperatures rise, aphids also increase day by day and must be controlled.
Control methods:
1．Spray 40% omethoate or 50% phosmet after diluting with water 1200—1500 times.
2．For a small number of potted flowers, you can also spray a 70--100 times dilution of neutral laundry detergent solution.
Red spider mites:They begin to cause damage to jasmine, Chinese hibiscus, asparagus fern, Chinese rose, and dahlia, among others, from early April.
Control methods:For a small number of potted flowers, frequently rinse the front and back of the leaves with tap water, or spray or dab with boiled and cooled 100--150 times diluted flour paste water, then rinse once more with clean water after one or two days, which can achieve obvious results.
Scale insects (flower lice):Scale insects on white magnolia, Chinese rose, boxwood, and pittosporum mostly begin hatching from mid-April to mid-to-late May.
Control methods:
1．Before they hatch, gently brush off the insects by hand.
2．Check frequently, and during the larval hatching period spray 40% omethoate at 1000--1500 times dilution.
Damping-off:When the temperature reaches 20°C, newly sown flowers, saplings, and some flowers prone to root rot are highly susceptible to damping-off when soil moisture is high.
Control methods:
1．Before sowing, evenly mix 1.5--4 kg of 70% quintozene per mu into the soil.
2．Control watering during the tender seedling stage, and do not make the soil too wet. 3. When diseased seedlings are first found, irrigate with 1% ferrous sulfate or 200--400 times diluted 50% amobam solution, applying 2--4 kg of the solution per sq m.
Rust:Crabapple rust easily infests flowers and trees in large amounts after rain in April--May, and rose rust infests when rose buds are forming.
Control methods:
1．When roses sprout, promptly pick off and burn the yellow diseased buds that sprout first, eliminating the source of infection.
2．During the initial infection period, spray 15% triadimefon at 700--1000 times dilution.
Powdery mildew:Chinese rose powdery mildew, and garden balsam and smoke tree powdery mildew mostly occur in May--June, and in summer easily cause symptoms such as yellow leaves, withered leaves, and curved tender shoots.
Control methods:
1．Pay attention to ventilation and light transmission for the flowers.
2．Apply less nitrogen fertilizer and more phosphorus and potassium fertilizer.
3．Spraying 15% triadimefon at 700--1000 times dilution once during the initial infection period is sufficient.