What pesticides are effective for osmanthus scale insects
This article introduces some practical tips for dealing with osmanthus scale insects, including information on which pesticides are effective. Below, the editor provides a detailed explanation.
What pesticides are effective for osmanthus scale insects
During the nymph hatching period, you can spray 20% pyrethroid emulsion or 2.5% bromide** ester emulsion 2500 times to control; when the scale forms, spray 40% fast-acting emulsion 1500 times for good control. For prevention, you can cut off the infested branches and clean up the fallen leaves in winter, and destroy them in a centralized manner, or scrape off the overwintering insects on the branches, or spray a 5-10% light diesel emulsion for better results.
Symptoms of osmanthus scale insects
The symptoms of osmanthus scale insects are manifested as nearly circular or irregular spots on the infected leaves, with diameters of 2-5 millimeters. The spots are initially brown, later turning gray in the center with a red-brown edge. Fine grayish-brown mold spots are scattered on both sides of the spots, often merging and causing leaf death.
Osmanthus scale insect damageMost common diseases of osmanthus occur on the leaves, mainly including osmanthus brown spot, osmanthus leaf blight, and osmanthus (T-J) disease, which can cause early defoliation, weaken plant growth, and reduce the flowering and ornamental value of osmanthus.
Causes of osmanthus scale insects
For osmanthus scale insects, high temperature and humidity are often the triggers, which are transmitted by wind and rain, leading to infections. The condition will subside somewhat after October.
What pesticides are effective for osmanthus scale insects
Osmanthus scale insects can be treated. Using thiacloprid, thiamethoxam, fenoxycarb, acetamiprid, chlorpyrifos, veratrine, or matrine and other reagents for foliar spray, as long as the spray reaches the scale insects, it can kill them.
Methods to control osmanthus scale insects
Methods to deal with scale insectsThe method to deal with scale insects is to spray 20% pyrethroid emulsion or 2.5% bromide** ester emulsion 2500 times during the nymph hatching period for control; when the scale forms, spray 40% fast-acting emulsion 1500 times, as it has strong permeability and good control effects.
Preventive measures for scale insects1. Manual brushing: The bodies of osmanthus scale insects are covered with a layer of keratinous shell, making direct spraying less effective. It is necessary to choose the right time and method. When there are a small number of insects, you can gently brush them off with a soft brush for good results.
2. Winter control: In winter, cut off branches with insects and clean up fallen leaves, and destroy them in a centralized manner, or scrape off overwintering insects on branches, or spray a 5-10% light diesel emulsion or 3-5 degrees of lime sulfur solution.
3. Summer control: Spray pesticides for control at the early hatching stage of nymphs in summer when no wax is secreted or when the wax layer is initially formed. You can choose to spray 0.3 to 0.5 degrees of lime sulfur solution or 10% imidacloprid 1500 times, alone or in combination, every 7 to 10 days, for 2 to 3 times.
4. Tree trunk application: In April, lightly scrape the bark of the tree trunk into two semi-circles that are offset from each other, with a width slightly equal to half the diameter of the trunk, and apply 400-500 times of imidacloprid, dichlorvos, dimethoate, and other systemic insecticides, then wrap tightly with polyethylene film, and remove after 15-20 days.
5. Tree trunk injection: Inject from three directions at a 120-degree circular angle on the tree trunk, using 0.2 grams of systemic insecticide (active ingredient) per centimeter of trunk diameter, and seal the hole with mud after injection.
The above-sharing of tips on what pesticides are effective for osmanthus scale insects in green plants and flowers hopes to bring you some help in life!