What are the common pests of household flowers? Common pest control methods for flowers

  The common pests of household flowers include aphids, fungus gnats (sciarid flies) and whiteflies, which not only spoil the ornamental value of flowers but also seriously threaten their healthy growth. There are two main methods of flower pest control: one is manual killing, mainly for larger pests present in small numbers, and the other is chemical spraying, mainly for pests with chewing mouthparts, such as scarab beetles and larvae of the order Lepidoptera.

  1. Aphids

  Damage symptoms: Aphids are small greenish-yellow insects that often cluster densely on the new shoots or flower buds of Chinese rose, pomegranate, chrysanthemum and others, sucking sap with their mouthparts, which causes tender leaves to curl and shrivel; in severe cases it affects growth and flowering, making the plant's leaves curl and wither, and produces galls and spreads viral diseases.

  Control methods: Apply tobacco water (50-fold dilution) or soapy water to the leaves several times in succession; spray with 25% rotenone extract at 800-1000-fold dilution, 40% omethoate at 2000-fold dilution, 3% natural pyrethrum at 1000-fold dilution and deltamethrin at 2000-3000-fold dilution.

  2. Red spider mites

  Damage symptoms: They mainly harm rhododendrons, Chinese rose, scarlet sage, crabapple, cactus, Chinese juniper and others, piercing and sucking sap with their piercing-sucking mouthparts, causing small yellow-white spots on the leaves, and even leaf scorching or dropping.

  Control methods: Remove weeds from the pot to eliminate overwintering eggs; improve ventilation and lower the temperature; for chemical control, use acaricides such as diafenthiuron, abamectin, pyridaben, fenpropathrin, amitraz, dicofol or omethoate at 100-fold dilution, sprayed alternately on the leaf surface in the early stage of red spider mite infestation.

  3. Fungus gnats (sciarid flies)

  Flowers damaged: Commonly seen in potted flower cultivation or herbaceous flower seedling raising, such as poinsettia, cyclamen and pansy.

  Control methods: Use pesticides such as Huifu, Huijian and abamectin, applied as a root drench to control fungus gnat larvae.

  4. Thrips

  They mainly harm anthurium, cyclamen, rose, carnation, lisianthus and many other flowers. Thrips often rasp and suck sap on the underside of tender leaves and in flower organs, causing the damaged leaves to curl, turn yellow, become brittle and drop.

  Control methods: Integrated physical, chemical and biological control can be used; for chemical control, spray with pesticides such as Huijian, lufenuron, Huijian plus Kungfu, abamectin and spinosad.

  5. Scale insects

  Damage symptoms: The main scale insect species include mealybugs, red wax scales and cottony cushion scales. They mainly cluster and parasitize on the young tender stems and leaves of plants, inserting their piercing-sucking mouthparts into plant tissues to suck sap. They are one of the common pests of indoor foliage plants.

  Control methods: Manual control: brush off the insects with a brush and then rinse clean with water; chemical control: carry out during the peak hatching period of nymphs before the waxy scale covering has formed on the body, and choose isocarbophos at 1000-fold dilution, 20% fenvalerate at 1500-2000-fold dilution, 40% omethoate at 800-1000-fold dilution and other sprays for control.

  6. Whiteflies

  Damage symptoms: Whiteflies are widely distributed and harm many kinds of flowers. Whiteflies are small and white; the mouthparts of adults and larvae are inserted from the underside of the leaf to suck sap, causing the leaves to turn yellow and wither, while excreting honeydew on the leaves, which triggers sooty mold.

  Control methods: Spray 2.5% deltamethrin, 20% fenvalerate at 1500-2000-fold dilution and pyrethroid pesticides to control nymphs, adults and eggs, spraying once every 7 days, and 3-4 consecutive sprays are enough.

  7. Nematodes, white grubs and other underground pests

  Damage symptoms: They mainly bite and feed on plant roots and tender stems underground, causing roots and stems to rot and the plant to die.

  Control methods: Sterilize the soil with steam or chemicals; mix food with trichlorfon as a poison bait; drench the plant with 90% trichlorfon at 1000-fold dilution; hand-pick and kill them.

  8. Snails

  Damage symptoms: Snails mainly harm plant leaves, tender stems and roots, leaving the branches and leaves incomplete and affecting plant growth and ornamental value; in severe cases they can even cause the plant to die.

  Control methods: Scatter food mixed with trichlorfon in places where snails are often active as a poison bait; spray around the plant with trichlorfon or deltamethrin at 1500-2000-fold dilution; scatter 8% metaldehyde granules on the soil around the roots to kill snails.

Pest and disease control for household flowers

        As people's living standards rise, the creation of green homes is increasingly favored, and flower cultivation is becoming more and more widespread. However, while you carefully tend these fresh flowers and green leaves, some "murderers" also quietly arrive in your home. Some invade the interior of the flowers, growing stealthily inside, and finally make your leaves discolor and dry up, the branches necrose, and the whole plant rot; some gnaw and chew on the leaves, leaving them in tatters; some secretly suck sap on the underside of the leaves, making your flowers discolor and age. Under the ravages of these "murderers", some flowers have rotten roots and leaves and give off a foul odor, and some flowers or leaves are covered with fuzzy green caterpillars that make people loathe the sight. These are the pests and diseases of flowers.
        1. Flowers get sick too. Flowers, like people, are living organisms, and all their parts - roots, stems, leaves, flowers, fruits and seeds - can develop diseases. When people get sick they go to the hospital; when flowers get sick, we also have "plant hospitals" that diagnose and provide treatment options and sell medicines. If you want to grow flowers at home, you need to learn how to diagnose and treat diseases of flowers yourself. This is what we are going to teach you here.
        2. The troublesome pests and diseases. Here, we call any abnormality in flowers "flowers getting sick". Flowers getting sick is caused by the combined action of one or more factors. To classify it scientifically, the "diseases" of flowers should be divided into several major categories: diseases caused by pests; diseases caused by an unsuitable environment; and true "diseases". As follows: Diseases caused by pests: caused by harmful animals, including insects. There are a great many kinds of insects; some have nothing to do with people's lives; some are close friends of human life, while others can disrupt people's lives, and many of them can harm your flowers. These harmful animals that damage flowers are flower pests. Diseases caused by an unsuitable environment: unsuitable environmental conditions, including lack of elements, chemical pollution, pesticide phytotoxicity, and inappropriate measures during cultivation and management, as well as unsuitable various environmental conditions such as temperature and humidity. True "diseases": diseases caused by pathogens. The so-called pathogens are the fungi, bacteria and viruses that people are familiar with, and should also include organisms such as phytoplasmas and some parasitic nematodes. Many people collectively call them pathogenic bacteria, which, strictly speaking, is not very accurate. In fact, pathogenic bacteria refers to the fungi and bacteria among them. All the above categories can cause abnormalities in the growth of flowers and make them "get sick". But a more precise concept is that the diseases of flowers include "diseases" caused by adverse environmental conditions and pathogens, and "pest damage" caused by pests.

Spring pest and disease control for household flowers: common spring flower pests and diseases

There are more pests and diseases on flowers in spring, with damage being more severe in April and May. Common spring flower pests and diseases include powdery mildew, rust and black spot. Below we share spring pest and disease control for household flowers, so that you can grow your flowers well - take a look.

General methods for spring pest and disease control in household flower growing:

1. Keep the flower growing area clean and hygienic, which can reduce damage.

2. Protect the plants; do not break the skin or cause injuries, and guard against pathogen invasion.

3. Pre-disinfect the growing medium, which can kill pathogens and pests.

4. Strengthen daily management; keep water and fertilizer appropriate, air circulating, temperature suitable and light moderate, so that the plants grow robustly and the breeding and spread of pests and diseases are controlled.

Spring pest and disease control for household flowers

Below we introduce the specific control of the relevant pests:

1. Aphids

Aphids (nìchóng) - rose of Sharon, ornamental peach, hibiscus, Chinese rose, honeysuckle and others are all easily harmed by aphids. As the temperature rises, aphids also increase day by day and must be controlled.

Control methods: 1. Mix 40% omethoate or 50% imidan with water at 1200-1500-fold dilution and spray.

2. For a small number of potted flowers, you can also spray neutral laundry detergent liquid at 70-100-fold dilution.

2. Red spider mites

Red spider mites - jasmine, hibiscus, asparagus fern, Chinese rose, dahlia and others begin to cause damage from early April.

Control methods: For a small number of potted flowers, often rinse the upper and lower surfaces of the leaves with tap water, or spray or dip with boiled and cooled 100-150-fold flour paste water, then rinse once more with clean water after a day or two, which can achieve obvious results.

3. Scale insects

Scale insects (flower lice) - scale insects on white magnolia, Chinese rose, boxwood and pittosporum mostly begin to hatch from mid-April to mid-to-late May.

Control methods: 1. Before hatching, gently brush off the insects by hand.

2. Check frequently and spray 40% omethoate at 1000-1500-fold dilution during the larval hatching period.

4. Damping-off

Damping-off - when the temperature reaches 20°C, newly sown flowers, saplings and some flowers prone to root rot are highly susceptible to damping-off when soil moisture is high.

Control methods: 1. Before sowing, evenly mix 70% quintozene at 1.5-4 kg per mu into the soil.

2. Control watering during the tender seedling stage; do not make the soil too wet.

3. When diseased seedlings are first found, drench with 1% ferrous sulfate or 200-400-fold 50% amobam solution, applying 2-4 kg of the solution per sq m.

5. Rust

Rust - crabapple rust easily infects flowers and trees in large numbers after rain in April and May, and rose rust infects when rose buds are about to open.

Control methods: 1. When roses sprout, promptly pick off and burn the yellow diseased buds that sprout first, to eliminate the source of infection.

2. Spray 15% triadimefon at 700-1000-fold dilution in the early infection period.

6. Powdery mildew

Powdery mildew - Chinese rose powdery mildew, and powdery mildew on garden balsam and smoke tree, mostly occur in May and June, and in summer easily cause symptoms such as yellow leaves, withered leaves and curved tender shoots.

Control methods: 1. Pay attention to ventilation and light penetration for the flowers.

2. Apply less nitrogen fertilizer and more phosphorus and potassium fertilizer.

3. Spray once with 15% triadimefon at 700-1000-fold dilution in the early infection period.