What s the deal with white spots on sunflower leaves?

Sunflower leaves with white spots.

Maybe it's powdery mildew!

1. Strengthen cultivation management.

1) Nitrogen fertilizer should not be applied too much, potassium and fertile leaf calcium fertilizer should be appropriately applied to enhance the growth of plants and improve disease resistance.

2) Prune and shape in a timely manner, remove diseased shoots and leaves, and improve ventilation and light transmission conditions between plants.

2. Prevention first, supplemented by **.

1) Spray 45 stone sulfur mixture once in early spring before germination.

Crystallization 150 times.

2) Spray 50 antibacterium 1000 times or 50 carbendazim every 10 to 15 days near the onset period.

1000 times or 1500 times the liquid of the fungus shark for prevention.

3. Pharmaceutical prevention and control.

At the beginning of the disease, spray 15 powdery rust rather wet powder 800 to 1000 times, 70 methyl tobuzin.

WP 800 to 1000 times, all have good ** effect. The residual effect period of powdered rust can reach 20 to 25 days, if the first time, the white powder layer of the damaged part after spraying becomes dark gray, and shrinks and disappears. Special Elixir:

Pentecosta, etherstrobin, amisidad and other special effects on fungal diseases.

To isolate from healthy plants, cut off the diseased branches and leaves and destroy them, spray 50% carbendazim 500 times liquid, 75% thiophanate-methyl 1000 times liquid at the beginning of the disease, and spray 15% fenrustinin 1000 times liquid when the disease is serious. Spraying should be insisted on spraying once every 7-10 days, and spraying 2-3 times in a row.

Sunflower belongs to the purslane family succulent herbaceous plants, which prefer a warm, dry, sunny environment, and is mainly propagated by sowing and cuttings. Sowing can be carried out in March and April every year, and the natural flowering period starts in May and can continue to bloom for up to half a year. It's the height of summer, it's the peak flowering period of the sunflower, and the colorful flowers are blooming!

What's going on with the sunflower leaves growing upwards?

Sunflower grows fast, strong branching ability, is a cluster of herbaceous plants, long-term lack of sunlight and watering too often, the branches will grow upward, leaf spacing becomes very wide, giving people a sense of disorganization, slender branches can even be as high as more than ten centimeters, the later lodging slowly becomes a weeping pot creeping growth, not only ornamental is not good, the plant type becomes very loose, the later flowering amount will slowly decrease.

How to prevent the growth of sunflower branches?

More sun] Sunflower is a sun-loving plant, not afraid of the sun, in addition to not tolerant to severe cold, the entire growth period and flowering period can be exposed and raised, and the whole acacia can return to the sun. Spending more time in the sun not only controls the height of the plant, prevents the branches from growing, but also facilitates flowering.

Less watering] Sunflower is a drought-tolerant plant, and it can grow well even if it is not watered in the open state, relying only on sunlight and rain. Potted culture is watered according to the dryness and humidity of the potting soil, and it can be seen dry and wet.

Frequent pruning] When the sunflower appears slender branches, light upward growth, and few branches, it can be appropriately topped, breaking the top advantage to promote branching, and the branches can only continue to bloom in the later stage. Sunflower is a cuttingable plant, and the pruned branches can be cut separately, which not only controls the shape but also propagates new sunflower seedlings, killing two birds with one stone.

Frequent application of thin fertilizer] Although sunflower is not picky about the soil and can tolerate barrenness, it will grow better if it is cultivated with loose and fertile soil! Due to the long flowering period of sunflowers, a large amount of nutrients need to be consumed, and daily care can be diligent to apply thin fertilizer to promote the lush branches and leaves, long flower buds, organic fertilizer, compound fertilizer, slow-release fertilizer, diluted liquid fertilizer can be.

Through our introduction, I believe that everyone has a deeper understanding of what is going on with the sunflower leaves growing upwards and what is going on with the white spots on the leaves of the sunflower.

Reply. 1. Causes of solar burns: pothos can not withstand strong light, suitable for growing in semi-shade, if it is kept in a place of astigmatism for a long time, and suddenly move the pothos to a position with strong light, it may cause solar burns to form white spots. Workaround:

When cultivating pothos, be sure to avoid direct sunlight and try to keep them in soft light to avoid being burned. Pothos.

2. Causes of infection: Improper maintenance during growth may cause pothos to be infected with leaf spot, and after being infected with this disease, it will harm the leaves, resulting in spots on the leaves, and then the lesions will gradually expand, causing the leaves to turn yellow and wilt. After being found to be infected with leaf spot, it is necessary to strengthen ventilation, maintain air circulation, cut off the diseased leaves, and then spray 500 times of 70% zinc dyszeb wettable powder**.

Pothos. 3. Reasons for lack of nitrogen fertilizer: Pothos is a foliage plant, in order to promote healthy growth and maintain the beauty of leaves, we must pay attention to reasonable fertilization. Lack of nitrogen fertilizer can lead to white spots on the leaves.

Reasonable fertilization of pothos, while ensuring the base fertilizer, also needs reasonable topdressing to meet the needs of various nutrients. Pothos.

4. Causes of water problems: If the method of drenching water is adopted, there may be water droplets on the leaf surface, which may cause white spots. If you water too much or if the air humidity is too high, it can also cause white spots. Solution: Water the pothos properly and maintain good ventilation.

Can I send a question?

Each leaf has a white ring on it.

Is this what it looks like?

White spots should be.

Caused by compound scale insects, a small number of scale insects can be manually captured and scraped off. Pharmaceutical prevention and control: use 1500 times of 40% rapid culling (chlorphosphine) emulsifiable concentrate; 48% Lesben EC 1000 times liquid (suitable for controlling larvae under 2 instars); 150-200 times of dichlorfen oil or 99% green ying oil or 150-200 times of engine oil emulsion (if mixed with phoxanthron or malathion, it can not only increase the dilution amount, but also improve the scale killing effect); 1000 times of emulsifiable concentrate such as 50% phosphine, 40% melt scale, 45% scale killer or 20% scale killer; 50% malathion or 35% crack emulsifiable concentrate 800 times.

The best control period for chemical control of scale insects is from the initial hatching to the full incubation period of larvae, that is, from mid-May to mid-June, spraying once every 5 days, spraying 2-3 times in a row. If the appropriate period of prevention and control is missed, it is advisable to use mineral oil agents, such as dichloride, green ying or engine oil emulsion mixed with low-toxicity organophosphorus agents, so as to enhance the penetration of pesticides and improve the effect of killing scales.

It's mainly caused by the lack of water in your pineapple "leaf cup" (that is, the depression in the middle) for a long time, which is too dry!

Pineapple is different from other plants, watering does not need to water potting soil, only need to be watered with water in the leaf cup, let the water naturally flow into the potting soil a little, even if the potting soil is dry, there is water in the leaf cup, and the leaves will still not curl!!

There are yellow spots, you need to check carefully, there is indeed a "red spider" harm, note that this insect is very small, there are yellow food marks on the leaves after the damage, you need to spray dicofol, nisolan and other control.

If there is no spider mites, it is a disease, and it can be controlled by spraying 2 times of carbendazim or metropium, with an interval of one week each time.

In addition, pineapples need to scatter light, so don't go without sunlight for a long time! No fertilization is required during flowering!