10 Common Rose Diseases and Pests Identification and Treatment
Here is an introduction to the identification and treatment of 10 common rose diseases and pests in green plant maintenance. Let's take a look together.
10 Common Rose Diseases and Pests Identification and Treatment
Today's list includes common rose diseases and pests, which I believe every rose enthusiast has encountered to some extent.
As many families have children or pets, using pesticides poses a great risk, and pesticides are also harmful to the environment and health. Therefore, the following methods of treating diseases without medication have been collected from the practical experience of various rose enthusiasts, including physical methods (using tools), and biological methods (using natural enemies to control pests). Let's get to the main topic.
Spider Mites - Pest
Cause: Multiply rapidly in high temperatures and dry environments, usually occur in summer
Symptoms: Leaves have grayish-yellow spots, turn yellow, and may even fall off; severe cases show spider webs
Medication-free treatment: Spray water on the back of the leaves with a high-pressure water gun
Medication: Acarinate, Jinmanzhi, Pyridaben, Abamectin
Aphids - Pest
Cause: Common in spring
Symptoms: Clusters of small green insects on tender buds, flower buds, or undersides of leaves
Medication-free treatment: Laundry detergent solution, chili water, cigarette butt water, ladybirds, and squashing with hands
Medication: Imidacloprid, Pyrethroids, Acetamiprid
Scale Insects - Pest
Cause: Poor humidity, ventilation, and lighting
Symptoms: White/grey/brown oval insects on the stems, leading to yellowing leaves, withering of branches, and stopping growth
Medication-free treatment: Use a brush like a toothbrush to scrape them off the stems
Medication: Scale insect killer
Thrips - Pest
Cause: Thrips prefer tender leaves and flower fragrance, and are prone to occur in dry weather
Symptoms: Leaves curl, do not unfold, do not bloom; stems, leaves, and petals have black spots
Medication-free treatment: Hang yellow or blue boards
Medication: Imidacloprid, Abamectin, Ailvshi (make sure to spray after sunset)
Cause: Poor ventilation, lighting, and high humidity; common in spring and autumn, during rainy season, and humid weather
Symptoms: White powder on new buds, leaves, and flower buds
Medication-free treatment: Wipe off the powder or cut off the affected leaves, improve ventilation, and spray rice vinegar diluted in water
Medication: Lunaasen, Zineb, Carbendazim, Chlorothalonil, Triadimefon
Black Spot - Fungal Disease
Cause: Common in rainy season, transmitted by nearby plants with black spot
Symptoms: Black spots on leaves, severe cases lead to leaf drop
Medication-free treatment: Remove diseased leaves, clean up fallen leaves, improve ventilation and lighting, and dry cultivation for a period
Medication: Zineb, Carbendazim, Chlorothalonil
Stem Sawfly/Leaf Sawfly/Cutworm - Pest
Differences: Stem sawflies and leaf sawflies pierce holes in tender shoots to lay eggs, with stem sawflies being more harmful, leaf sawfly larvae eat leaves; cutworms mainly roll up leaves to build nests
Medication-free treatment: Cut off the affected part if infested by stem sawflies; puncture the larvae with a needle where leaf sawflies have bored
Cutworms: Selective in plant species
Cutworms
Leaf Sawfly - Abdomen is yellow, lays eggs in clusters, larvae eat leaves
Leaf Sawfly Larvae
Stem Sawfly: The most harmful, I haven't encountered it yet
Whitefly - Pest
Symptoms: Tiny white insects, more common in summer
Medication-free treatment: Yellow and blue boards, ladybirds
Medication: Imidacloprid
Small Black Fly (Fungus Gnat) - Pest
Symptoms: Small black flying insects, larvae bite plant roots
Medication-free treatment: Yellow and blue boards, ladybirds, and covering soil surface with pine bark
Medication: Imidacloprid
Iron Deficiency - Nutrient Deficiency
Cause: Iron deficiency
Symptoms: Leaves are light yellow with green veins
Solution: Ferrous sulfate, Chelated iron, or ground planting
Preventing rose diseases is more important than treating them. Fungal diseases can be prevented by spraying carbendazim, Bordeaux mixture, lime sulfur solution, etc., in humid weather. Always pay attention to ventilation. That's all for today, I hope it helps everyone.
This article shares the complete content on the identification and treatment of 10 common rose diseases and pests, and green plant enthusiasts may refer to this for reference.