How to control scale insects on flowers? These methods are very practical
Scale insects often gather on branches, leaves, flowers, and fruits; adults and nymphs insert their specialized mouthparts into the flower tissue to suck sap, leaving irregular yellow spots on the leaves. In severe cases, the leaves dry up, the fruits shrivel, and sooty mold can be induced.
Control measures: During the hatching period, when the nymphs have not yet settled, spray pesticide. Spray omethoate or dichlorvos once a week for 3-4 consecutive times, and results will be seen. Spraying machine oil emulsion in spring has a certain control effect. In addition, drenching the roots with 500-times dichlorvos, or applying 3-10 grams of 10% carbofuran per pot also has a good effect.
A small number of scale insects can be scraped off manually with a bamboo strip. Branches with a high insect density should be thinned out, and overly dense branches should be thinned to improve ventilation and light penetration.
Spring flower scale insect control methods
Spring flower scale insects:The scale insect has the most species and harms the most flowers and trees, making it the worst among pests. Tortoise shell scale, white waxy, round. White peach scale, white, pointed. Oyster shell scale, dark brown, males elongated, females round. Helmet scale, dark brown, round, shaped like a helmet. Plants susceptible to scale insect damage include camellia, pomegranate, oleander, azalea, hibiscus, cherry blossom, plum, peach, crabapple, Chinese rose, and others. The larvae first suck sap on the leaves, causing the leaves to lose their green color; by the adult stage, they mostly suck sap on the branches and trunk, severely weakening the tree vigor and affecting flowering.
Control methods:Crush the pests by hand or scrape them off the leaves and branches with a small knife. During the larval stage, spray 1000-times 40% dimethoate emulsion 1-2 times, with an interval of 7-10 days between sprays.
Control of flower pests and diseases: aphids, red spiders, and scale insects
Aphids, red spiders, and scale insects are among the most common piercing-sucking pests harming flowers and trees. They damage many kinds of flowers and trees. Whether woody flowers such as Aglaia, jasmine, Chinese rose, banana shrub, and plum blossom, or herbaceous flowers such as chrysanthemum, geranium, and calceolaria, none are spared.Aphids. Aphids, also known as sticky insects, occur throughout the year, and generally reproduce fastest at around 39°C. There are many species of aphids, usually distinguished by green, yellow, black, and tea colors, harming Chinese rose, pomegranate, chrysanthemum, gardenia, and other flowers. They mostly gather on the buds, tender leaves, or tender branches of the plant, endlessly sucking sap and damaging the bud core and petals. The affected plant's branches and leaves turn yellow and become deformed, the flower buds spoil, the flowering period shortens, the flower color fades, and in severe cases the plant wilts and dies. Control methods:
(1) Use 50 grams of fresh chili peppers or dried red chili peppers, add 30-50 grams of water, boil for about half an hour, and spray the filtrate on the affected plants for a special effect.
(2) Use 3-4 grams of laundry detergent, add 100 grams of water, stir into a solution, and spray continuously 2-3 times; the control effect reaches 100%.
(3) Use "Fengyoujing" (essential balm) diluted with water at 600-800 times into a solution, and carefully spray the pests with a sprayer so that the pesticide liquid covers the insect bodies. The effect of killing aphids, scale insects, and other pests is above 95%, and it will not cause pesticide damage to the plants.
(4) Mix laundry detergent, urea, and water in a ratio of 1:4:100, stir into a mixed solution, and spray the plants with it; this can achieve the dual effect of killing pests and fertilizing.
Red spider mites
Red spider mites, also called short-whisker mites, are pests that specifically harm flower leaves, flowers, and grasses. Wild elm, Chinese plum yew, five-needle pine, and others in bonsai are also susceptible to red spider mite damage. The body of the red spider mite is about the size of a needle tip, dark red or purplish red; with the naked eye only small red dots can be seen, and only under a magnifying glass can the orange-red transparent spherical eggs be seen. Its nymphs often cluster on the undersides of leaves and on flower buds of some flowers, sucking sap with piercing-sucking mouthparts and harming the plant. Early symptoms of the flower include leaves losing green color, leaf margins curling upward, leading to withering and falling off, causing early shrinking of flower buds, and in severe cases plant death. Red spider mites have 7-8 generations per year, begin harming from March to April each year, and cause severe damage from June to July. Therefore, after the end of April, the plants should be frequently observed and checked. Under conditions of high temperature, high humidity, and poor ventilation, red spider mites reproduce extremely quickly, which is one of the important causes of plant death. Control methods:
(1) Soak citrus peel in about 10 times its amount of water for a day and a night, filter, and spray the plants; this can control aphids and red spider mites. If poured into the soil, it can prevent nematodes in the soil.
(2) Mix 15 grams of laundry detergent, 15 milliliters of 20% caustic soda, and 7.5 kilograms of water, then spray. Check one or two days later; the mortality rate of adult and nymph red spider mites is 94%-98%.
(3) Take 50 grams of plant ash, add 2500 grams of water, stir thoroughly, soak for two days and nights, filter, then add 3 grams of laundry detergent and mix evenly before spraying, once a day for three consecutive days, then after a one-week interval spray for another three days; this can eliminate the second-generation pests and can also control piercing-sucking pests such as aphids, red spider mites, and scale insects. Placing it into the soil can control maggots.
(4) Light one mosquito coil and place it in the pot of the diseased plant, then tie a plastic bag tightly around the pot. After about one hour of fumigation, both eggs and adults can be killed. This is a good method that is both economical and quick-acting.
Scale insects. The body of the scale insect is wrapped in a layer of horny shell, so directly spraying it with chemicals is not easily effective. Scale insects, like blood-sucking lice, suck the sap of the plant, thus causing great harm to flowers and trees. The affected plants not only grow poorly but also show phenomena such as yellowing leaves and early leaf drop. In severe cases, the plant withers and dies. Affected flowers include Aglaia, jasmine, camellia, banana shrub, and so on. Control methods:
(1) Mix white liquor with water in a ratio of 1:2. When treating pests, drench the surface layer of the pot soil thoroughly. Scale insects begin activity in spring when the room temperature is 7°C. You can drench once in mid-April, then about once every half month thereafter, and results will be seen after four consecutive times.
(2) Use 50 milliliters of edible vinegar (rice vinegar), dip a small cotton ball into the vinegar until wet, then gently wipe the stems and leaves of the affected flowers and trees with the wet cotton ball; this can wipe off and kill the scale insects. This method is convenient and safe, and it can not only achieve the purpose of pest removal but also make the affected leaves turn green and glossy again.
(3) Gently and repeatedly wipe the diseased plant with alcohol, and the scale insects can be removed, and removed very cleanly and thoroughly. For example, when wiping diseased orchid leaves with alcohol, not only can the scale insects be removed, but even larvae that cannot be clearly seen with the naked eye are all thoroughly killed, and in the second year few scale insect infestations are found. This method is simple, safe, and effective.
(4) Mix diesel oil, laundry detergent, and water in a ratio of 10:0.6:6 to make a stock solution. At this time the stock solution contains 60% and appears milky. After diluting with water to a pesticide liquid containing 30% oil, carefully spray the scale insects on Aglaia, kumquat, and sago palm. After one week, most of the scale insects change from their original fresh orange color to a shriveled state, indicating that this method has a good control effect on scale insects.