"five small pests" scale insects which medicine is the most effective? What are its natural enemies?

Scale insects, also known as scale insects, mainly harm all kinds of fruit trees, flowers, succulent plants and other plants. They often cluster on branches, leaves and fruits and absorb plant sap for a living. In serious cases, they will cause plant death. Today, the editor will introduce to you what drugs are most effective for scale insects. What are its natural enemies?

1. Brief introduction of scale insects

1. Scale insects are insects of the family Homoptera, most of which are covered with waxy secretions, dioecious, wingless females, males have a pair of membranous forewings, and the hind wings are transformed into balance rods.

2. Morphological characteristics.

Female adults: oval, relatively flat, long 5mm, wide about 3mm, light pink, with thick white wax powder.

Male adult: purple-brown, about 1mm in length, about 2mm in wingspan, 1 pair of wings, transparent.

Egg: oval, light orange, oocyst white floc.

Nymphs: oval, flat, yellowish.

Pupa: lavender, long 1.2mm.

3. The common scale insects are Japanese bulbous scale, Kang's pink scale, pear round scale, mulberry shield scale, grass paramecium and so on. The scale insects harm leaves, branches and fruits.

4. once the female and larvae of scale insects are Eclosion, they live on the branches, leaves or fruits all their lives, resulting in yellowing of leaves, withering of branches, decline of tree potential, and serious plant death. the damage of this insect is listed as the first of the "five small pests" in the garden.

5. Scale insects are widely distributed at home and abroad, mainly harming apple, pear, peach, apricot, plum, plum, cherry, citrus, loquat, grape, walnut, persimmon and other fruit trees, bamboo evergreen, ivy, jasmine, begonia, cherry blossom, rose and some succulent plants.

6. Scale insects have strong reproductive ability, the high temperature and high humidity weather in summer is the period of high incidence of insect pests, and the damage is the most serious from late May to early June.

What kind of medicine is the most effective for scale insects?

Mid-late March is the first critical period for the removal of scale insects in a year, when scale insects enter the recovery period after overwintering, with poor drug resistance and easy to control.

1. Control methods of scale insects in fruit trees.

Agricultural control: for the initial orchard, timely and thoroughly cut off insect branches or artificial brush with insect branches, require brushing, cutting, concentrated burning, do not throw, in order to eradicate the source of insects.

Drug control: because scale insects have waxy shells, the best fungicides are varieties with strong permeability and internal absorption.

① Japanese bulbous scale, it is recommended to use Likos (40% chlorpyrifos) 1000 times + silk run 3000 times to control

② scale sprays Likos (40% chlorpyrifos) 1000 times or Longlile (44.5% cyanogen chlorpyrifos) 1000 times when no wax is formed or when the wax layer is just beginning to form.

③ Kang's pink scale, choose Lix (40% chlorpyrifos) 1500 times or Longlile (44.5% cyanogen chlorpyrifos) 1500 times + silk run 3000 times to control.

It is best to use pesticides alternately to avoid drug damage. Spray every 7 to 10 days for 2 to 3 times in a row to kill nymphs on trees. Spray them on scale insects and wet all branches inside and outside the canopy evenly. It is appropriate to start dripping water.

2. Control methods of scale insects in flowers and succulent plants.

Physical control: if it is a newly occurred pest, it can be poked to death with a needle, toothpick, tweezers, or brushed off directly with a toothbrush, but it is best to remove it after dipping some soapy water with a toothbrush.

Biological control: wipe with alcohol with a concentration of more than 75%, dip an appropriate amount of alcohol with a brush and wipe the pest parts repeatedly. If the leaves are too dense and difficult to wipe, you can directly drench the seriously damaged leaf center with alcohol; you can also use vinegar and water to convert it into the proportion of 1:1, soak the plant or wipe it directly.

Drug control: spray with 2000 times of 25% chlorpromazine wettable powder, once every 15 days, twice in a row.

After getting rid of the scale insects, remember to change the soil and basin.

What are the natural enemies of scale insects?

In addition to the methods mentioned above, we can also put its natural enemies to exterminate. what are the natural enemies of scale insects?

The natural enemies of scale insects are rich, such as square head beetle, gray-lipped ladybug, oligo-ladybug, big red ladybug, Australian ladybug, black edge ladybug, aphid wasp, golden aphid wasp, double-banded giant-horned wasp, gibbous wasp, flat-horned wasp, lacewings and other predatory and parasitic natural enemies.

In addition, when using chemical control, try to avoid spraying during the peak period of natural enemies, and select varieties with high efficiency and low toxicity to reduce the damage to natural enemies.

4. When is the best time to kill scale insects?

The best period for killing scale insects is from egg incubation to nymph stage, when the wax layer of scale insects is not formed or has just been formed, it is sensitive to drugs, the dosage is low and the effect is good.

The above is the relevant introduction of scale insects. For the control of scale insects, we must grasp the best period of drug use, and it is best to control them at the nymph stage. In addition, warm and humid weather is conducive to the occurrence of insect pests. We must always pay attention to the situation of plants.