Insects
It is an important pest on citrus and grapefruit, and the common ones are red roundworm, brown roundworm, kangpan worm, yagura-tip ant and blowing sponge bug. The size of the insect shell is particularly small, but the damage to the plant is not small, they will cling to the plant, all the time is sucking the sap of the plant, and eventually the state of the plant will be worse and worse.
First, the characteristics of the hazard
Insects often live in groups on young branches, petioles, leaves, stems, and fruits of plants, sucking up sap. The trunks of the fruit trees or seedlings that have been sucked up are off-white and the branches are pale yellow. The light is poor growth, the leaves are yellow and fall off, and the heavy branches are dead, and the whole plant dies.
Adults with insect shells have 4 main characteristics:
(1) Morphological degradation, pectoral foot degradation or complete disappearance, the general insect state of the insect shell insect has no ability to move, except for the hatching larvae, are fixed in one place for life and never move, and the feeding is also fixed in one place and will not move;
(2) It can secrete wax to cover the insect body, form a variety of mesembranous shells, and with the increase of the age of the insects, the mesohusia thickens, and the drugs are generally difficult to reach the insect body;
(3) After the insect is harmed, its excrement is easy to induce plant coal pollution, and the surface of the branches and leaves is covered with black mold layer, hindering photosynthesis;
(4) The amount of reproduction is large, and the number of eggs laid by each female worm reaches thousands.
Second, the difficulty of prevention and control
1. In the early stage of insect damage, the insect body is too small to be easily found.
In the early stage of the insect damage, the nymph body of the insect shell insect is generally relatively small, and often attaches to the branches of the plant, coupled with the shade of the leaves, etc., so it often does not attract people's attention in the early stage of the hazard, thus missing the best control period.
2, the harm in the later stage, the wax layer has been formed, not easy to prevent.
In the late stage of the insect damage, the insect body of the insect gradually expands, and when people finally notice it, its surface often has formed a shell and waxy layer, and it is difficult for the general drug to penetrate into the insect body at this time, so that the desired control effect cannot be achieved. And it does not achieve the strongest effect.
3. Comprehensive prevention and control
1. Biological control and do a good job in the protection and utilization of natural enemies
There are many natural enemies of the insect shell, such as ladybirds, grass parasitic bees and predatory thrips, etc., to increase protection and utilization. Instead of spraying in the early heyday of natural enemies, if conditions permit, artificial breeding and the introduction of natural enemies can be stocked, so that natural enemies can maintain a certain number or population, and play a better control role in the population of ticks.
2. Physical prevention and control
Before the eggs hatch in the early spring, the yellow sticky cordyceal tape of the tree trunk can effectively prevent the hatching insects in the soil from getting on the tree or laying eggs.
3. Agricultural prevention and control
Combined with winter pruning, the removal of insect eggs, the removal of harmful insect branches, the reduction of the source of overwintering insects, and the complete burning of dead branches and debris, and the reduction of the overwintering base to alleviate the source of insects in the coming year.
4. Chemical control
When the insect is still in the nymph stage, the maximum effect can be achieved by preventing the insect shell at this time. In May/June of each year, pesticides should be sprayed early to prevent the harm of ticks. At this time, the pesticides that can be sprayed are: [Jingbo Swordsman] / [Quethion]
【Lianyou quinophos】
1. This product is organophosphorus insecticide and acaricide, which has gastric toxicity and touch killing effect.
2. It has good permeability and has a certain egg killing effect.
3. High safety and easy to decompose.
4, insecticidal spectrum is wide: aphids, aphids, whitefly, etc., the effect on underground pests is also very good.
【Kyobo Swordsman】
1. Unique mechanism of action: it is compounded from thiamethoxamine and prazidazone, which has gastric toxicity and touch killing effect on pests, and has strong systemic conduction activity.
2. Wide spectrum of insecticidal: it has excellent control effect on citrus psyllids and ticks, and at the same time prevents and controls stinging mouthpiece pests such as rice planthoppers, aphids, thrips, whitefly and rice rice planthoppers.
3. Excellent ratio: 1:1 ratio, higher co-toxicity coefficient, higher insecticidal activity, more advantages in quick efficacy and effectiveness.
4, high suspension rate: smaller particle size, high suspension rate, more resistant to rain erosion
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