Cannabis leaves curl
Curling marijuana leaves is a concern for any grower. This problem clearly indicates that something is wrong with the plant. What exactly? This is the gardener and has to find out first of all, so that he can quickly and timely get rid of the problem.
Rolling leaves is an ambiguous symptom. It can point to:
Marijuana plant disease;
Unfavorable cultivation conditions;
The emergence of insect pests.
Let’s consider each of the options in more detail.
Cannabis diseases leading to leaf curling
The tobacco mosaic virus is capable of infecting more than 350 representatives of the flora. Most often it settles on tobacco, tomatoes and peppers. It penetrates the plant tissue and destroys chlorophyll, the main substance responsible for photosynthesis. This disease results in the loss of a significant portion of the marijuana crop, which is unacceptable for the grower. The main symptoms of tobacco mosaic include:
Leaves begin to deform and curl;
The disease usually manifests itself on young leaves;
The foliage acquires an unusual mosaic pattern of spots of yellow, beige and green colors.
Powdery mildew is probably familiar to all gardeners. This is one of the most common fungal diseases in the flora. It is a whitish-gray bloom that appears on the foliage surface. Powdery mildew spores, which are responsible for reproduction, resemble dark brown balls in appearance. Its main symptoms include:
White spots on the surface of the leaves;
White-gray powdery bloom on foliage;
The development and growth of the marijuana plant is greatly slowed down;
The leaves begin to turn yellow, deform and curl, and at the final stage they die off.
Environmental factors leading to curling of cannabis leaves
Most often, windburn occurs in indoor cannabis. It is caused by the constantly blowing air from the fan in the same direction. Hemp loves a light, refreshing breeze, but when it turns into a real hurricane, it does not bode well. Symptoms of a windburn include:
The leaves of marijuana curl and / or bend downward, taking the form of animal claws;
Yellow, brown and bronze spots appear on the foliage.
And although the symptoms of a windburn are very similar to those of many other problems, their non-systemic nature will testify in its favor. Foliage away from the wind will be perfectly healthy.
Unfavorable temperature conditions
Very often, hemp leaves curl and shrink from the wrong temperature regime. When the thermometer reaches 30 degrees indoors or outdoors, the plant begins to feel uncomfortable. If cannabis is left in these conditions for several days, then temperature stress will become inevitable. Its symptoms are:
The foliage begins to curl upward, taking the form of miniature boats;
The leaves begin to turn yellow. Brown or bronze spots appear on them;
All foliage dries up, becoming brittle and fragile.
Similar symptoms can occur at low temperatures when the plant gets frostbite. Its leaves curl into a tube, acquiring an unhealthy color.
If cultivation takes place on a windowsill, then the leaves may curl when touched by hot or cold glass. In this case, the problem will not be of a systemic nature.
Improper plant care
Excess and deficiency of nutrients
If the grower uses inorganic fertilizers, the foliage may be curled up due to an oversupply of nutrients that can block them. As a result, the plant becomes unable to assimilate the necessary macro- and microelements contained in the soil. There is a lack of them.
Nutrient blockages and deficiencies have common symptoms:
Leaves begin to curl and turn yellow;
Plant development slows down, it becomes fragile and weak
A favorable level of soil acidity for marijuana is considered to be an indicator of 5.5-6.5. If it is lowered or raised, then the plant will have problems with the absorption of nutrients. She will not be able to fully satisfy her needs. The foliage will begin to turn yellow and curl, and growth and development will slow down.
The soil pH level is influenced by its composition, the water and fertilizer used to irrigate the hemp.
Excessive or insufficient watering
Excessive watering makes the soil too wet and constantly damp. The earth becomes compacted, which prevents oxygen from reaching the roots. In such an environment, the roots of the plant begin to experience stress, which inevitably affects the aerial part of the cannabis. Its leaves begin to curl and deform. If the problem is started, the root system will begin to rot, which will lead to the death of the plant.
Insufficient watering during dry periods can also lead to foliage curling. Due to the lack of moisture, the plant can experience heat stress. In hot months it is necessary to monitor the plant more carefully, watering it regularly.
The appearance of insect pests
Quite often, marijuana leaves begin to curl and shrink from insect pests that have settled on the plant itself or in the ground. To correctly identify the problem, the leaves must be carefully examined on both sides, and the topsoil must also be checked. There are several types of parasites that can lead to this problem.
This is a dangerous small pest that colonizes the plant. They feed on his juice. The plant starts to experience exhaustion, which leads to curling of its foliage. Aphids can destroy a plant in a matter of days. It can be found on cannabis foliage and stems.
Ticks are very small insects that are difficult to see even under a magnifying glass. Most often, their presence is recognized by symptoms. Hemp leaves begin to blister, curl up into a tube and become covered with a film. Growth and development of plant growth slows down, outwardly it becomes wilted. Quite often, the inflorescences become brown.
This insect is considered one of the most harmless. Visually, he is a small red spider. It damages cannabis only with its cobwebs, which envelop the foliage. It curls up into a tube and becomes unable to fully carry out the process of photosynthesis. As a result, the plant lacks vital energy and dies.