What pesticides are used to control pests and diseases on bayberry trees?
The bayberry tree is a common fruit tree, and its fruit, the bayberry, is a famous fruit in our country, spherical in shape, dark red or purplish red in color, and tastes sweet and sour. So, what pesticides can be used on bayberry trees?
Bayberry trees generally do not need pesticides, but if pests and diseases occur, pesticides are needed for control. Its diseases include canker disease, rust disease, brown spot disease, dieback disease, branch rot disease, and coral spot disease, among others, and its pests include pine moth, large bagworm, small bagworm, white bagworm, globose scale, inchworm, leaf roller, lappet moth, small leaf miner, fruit-piercing noctuid, brown longhorn beetle, and root-knot nematode, among others, which can be controlled with the corresponding pesticides.
1. Canker disease
Symptoms: It mainly damages the branches and trunk of bearing trees, while young trees and seedlings rarely develop the disease. In the early stage of the disease, small milky white protrusions appear at the affected site, with a smooth surface, which then gradually enlarge to form tumors, making the surface rough or uneven, suberized, very hard, and brown or dark brown.
Medication: The pathogen mainly overwinters inside tumors on branches and the trunk. Before spring budding, prune out diseased and pest-infested branches as much as possible. For tumors on large branches, the tumor can be cut off with a sharp knife, and then the wound can be disinfected with a 50-fold dilution of antibacterial agent 402 or a 100-fold dilution of copper sulfate. Before spring shoots emerge, spray 1:2:200 Bordeaux mixture once thoroughly.
2. Brown spot disease
Symptoms: It mainly damages bayberry leaves, eventually causing a large number of fallen leaves, and resulting in the death of flower buds and small branches. At the initial stage of symptoms, pinhead-sized purplish red spots appear on the leaf surface, then gradually expand into round or irregular lesions.
Medication: 7-10 days before fruit harvest, spray once with a 800-fold dilution of 70% thiophanate-methyl, a 1000-fold dilution of 50% carbendazim, or a 600-fold dilution of 65% mancozeb. After harvest, apply 1:2:200 Bordeaux mixture once for control.
3. Coral spot disease
Symptoms: It mainly damages bayberry branches and the trunk, weakening tree vigor, causing branches to die, and eventually the whole tree to die. After infection by this disease, orange-red powder densely covers the main trunk, main branches, side branches, and small branches, tree vigor declines, fruit size becomes smaller, and the taste becomes sour. Finally, the branches die, until the whole tree dies.
Medication: Each year during the period when the pathogen becomes active and spreads (early to mid-April, mid-June), spray the trunk and branches with a 1000-2000 fold dilution of wendake for protection. When spraying in the low-temperature month of April, the concentration of the solution should be lower, about a 2000-fold dilution. If wendake is unavailable, a 5% ferrous sulfate solution can also be used for control.
4. Leaf roller
It mainly damages bayberry leaves. During the occurrence period from May to June, it can be controlled with Bacillus thuringiensis and insecticides; highly toxic pesticides must not be used. During the damage period of the second-generation larvae in July-August, it can be controlled with a 1000-fold dilution of 90% trichlorfon or a 1500-fold dilution of 50% fenitrothion emulsion.
5. Lappet moth
It mainly damages bayberry leaves. During the hatching period of the first-generation larvae, it can be controlled with biological pesticides such as Bacillus thuringiensis and insecticides. During the hatching period of the second-generation larvae, it can be controlled with a 2000-fold dilution of 20% fenvalerate emulsion or a 3000-4000 fold dilution of 2.5% cyhalothrin emulsifiable concentrate.
6. Fruit-piercing noctuid
It mainly damages bayberry fruit. Cut ripe melons and fruits into small pieces, soak them in a 50-100 fold dilution of 80% dichlorvos emulsion for half an hour, then sprinkle on brown sugar liquid, and place them on the tree to trap and kill adult moths.