Scale insect, also known as? Scale insect? . Scale insects are an important pest on citrus and grapefruit, and the common ones are Hemistichopus rubra, Hemistichopus fusca, Hemistichopus kangensis, Echinococcus and Hemistichopus. Scale insects harm leaves, branches and fruits.
1. What is the cause of scale insects?
The occurrence of scale insects is closely related to the growth environment of Chinese rose. Generally speaking, there are several points. Temperature, rainfall and wind have great influence on the population of scale insects. At 25~26℃, when the humidity is high, a large number of outbreaks will occur, and when the humidity is lower than 15%, a large number of deaths will occur, so drought is not conducive to reproduction, and wind can make scale insects spread faster.
Second, why is it difficult to treat?
The traditional method is to spray sulfur mixture on the whole tree before germination in early spring to prevent female adults from overwintering. However, many fruit farmers report that the control effect of this method is not ideal, and the orchard that has been managed is still serious in the later stage. The main reason is that the overwintering female adults are protected by their shells, but the temperature is low in spring, so drugs can't penetrate into the shells, and it is difficult to kill the overwintering female adults.
So how to kill scale insects?
Third, scale insect control measures
1, strengthen orchard management, timely fertilization and irrigation, meet the demand of fruit trees for water and fertilizer, and improve the insect resistance of fruit trees.
2, combined with plastic pruning, burning branches with insects.
3. Grasp the control time: The best control period of scale insects is the incubation period of scale insects in May. It is easy to control before the protective wax coating is produced. When scale insects wear thick wax shells, it is difficult to control them with any medicine.
4. Kill eggs, cut off the breeding chain, scale insects fly short distances, and quickly cut off species after killing eggs is the best control measure.
5. Control agent:? Thiamethoxam? +? Propyne ether? +? Strong assists?
Toyama 25% thiamethoxam can be used. Product features:
1, broad insecticidal spectrum, obvious control effect: it has both stomach toxicity and contact activity, low dosage, and obvious control effect on sucking pests such as scale insects, aphids, whiteflies, thrips, planthoppers and leafhoppers.
2, rapid action and long lasting period: the medicament can strongly penetrate into plant tissues and is not easy to photolyze; Resistant to rain erosion; It lasts for 2-4 weeks.