How to get rid of bugs on roses naturally
On Valentine’s Day, people give roses because they represent love. When roses grown at home are infested with rose stem sawflies, two drops of dichlorvos need to be sprayed. When Spodoptera exigua is infested, spray trichlorfon to remove it. When spider mites appear, spray insecticide on the front and back of the leaves. Aphids can be removed with washing powder and water. You can try it.
Powdery mildew
Symptoms: In the early stage, small reddish-brown patches will appear on the front and back of the leaves. In severe cases, white powder will appear on the branches, tender tips and leaves.
Treatment: Treatment with flusilazole or difenoconazole can be used. In addition, when spraying treatment drugs, be sure to add protective agents, such as chlorothalonil, thiophanate methyl and other protective agents for prevention and strengthen ventilation.
Melasma
Symptoms: Reddish-brown/dark-brown spots appear on the front of the leaves initially, and the spots will gradually expand and yellow around them.
Treatment: After discovering the lesions, remove the diseased leaves promptly and spray them with pesticides. Use Shigao, Jintang or Nadiwen. Mainly spray the middle and lower leaves; spray the front and back of the leaves and the ground around the flower seedlings.
Rust
Symptoms: Small orange-yellow spots appear on the front of the leaves, raised vesicles appear on the back, and yellow powder piles will be scattered when mature.
Treatment: It occurs more often in rainy seasons. If diseased leaves are found, remove them promptly and spray benzyl and propiconazole.
Downy mildew
Symptoms: There is a thin layer of gray-white hairs on the back of the leaves, with irregular red/reddish-brown small patches, and occasionally the patches appear ulcer-like.
Treatment: Strengthen ventilation and spray duponkyl or propamocarb in time for treatment. It is best to spray the whole plant.
Anthrax
Symptoms: Circular lesions appear on the leaf edges, with dark brown edges and brown to light brown centers; in the later stages of anthracnose, these brown spots will pierce the leaves
Treatment: To treat these spot problems, we recommend medication: Shigao, Jintang or Nadiwen, Haoqingxian
Aphid
Symptoms: They gather on the buds, leaves and flower buds of roses and suck the juice. When large amounts appear, there is honey-oil-like black secretion.
Treatment: During the peak hatching period of overwintering eggs, alternate spraying of imidacloprid/avermectin can be used for prevention.
Starscream
Symptoms: Parasitism sucks sap on the back side of leaves, insects and insect feces can be seen on the back side, chlorosis caused by eating can be seen on the front side, and finally the leaves turn yellow and fall off. Form a net when the hazard is serious
Treatment: Insecticides must be mixed with egg-killing drugs. Use palm essential oil + etoxazole. Spray once every 3 days and 3 times in a row. After the third application, check the back of the leaves. If there are still living organisms, refill it and it’s basically done.
Thrips
Symptoms: Young branches and leaves are twisted and deformed, chlorotic and dry and brittle, flower buds turn yellow and dirty, and growth slows down.
Treatment: After spraying imidacloprid/Bayer Extreme/Longshi, cut off the affected flower buds and leaves
Leafcutter bee
Symptoms: Regular semicircular and circular cuts appear on the leaves
Treatment: Hang up yellow boards, hang insect-proof nets, and move the flower pots so that they can’t find them.
Scale insect
Symptoms: A group of insects often form a hard shell and eat the plants inside. In severe cases, it will cause poor plant growth.
Treatment: Use alcohol to wipe when the amount is small; use Muwangte when the amount is large.
Rhizobium
Symptoms: Mainly occur in wounds on root necks, lateral roots and grafting interfaces. The tumors gradually expand, causing the growth of flower seedlings to slow down or even stop.
Treat
Root nodule disease caused by rhizobia
① Break off the root nodules
②Apply antiseptic to the wound
③Drug recommendation: alcohol/copper sulfate solution (100 times)/streptomycin (200-400 units)
Root nodule disease caused by root-knot nematodes
① Use insecticides to kill nematodes
② After breaking off the root nodules, apply fungicide to the wound. (Same as above for drugs)
Original article author：Fragrant Road Full，If reprinted, please indicate the source.：https://www.theroadfull.com/article/2185.html
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