Why are there so many bugs in Shanghai recently? ...

Every evening in the past few days, there will be "flying insect rain" in some parts of the city. A large area of small flying insects, like rain, pounced on pedestrians and got into people's eyes, nostrils and mouths, which made people feel disgusting. Some people even worry that these Laodelphax striatellus will cause virus infection if eaten in their mouths.

These "small flying insects" are actually Laodelphax striatellus, which can spread virus diseases and affect crop growth, but are harmless to people and animals. After a week, the phenomenon of "flying insects flying all over the sky" will be improved.

Because of the low humidity in the early stage, Laodelphax striatellus developed late. Recently, the nymph emergence of Laodelphax striatellus is at its peak, and the rainy weather in the first two days is conducive to nymph emergence, so Laodelphax striatellus is relatively concentrated and has a large number. Laodelphax striatellus has phototaxis and likes green. At night, strong city lights will attract a large number of Laodelphax striatellus to migrate in a small area, so urban residents feel that there are many insects and green plants at night, and the closer they are to the insect source, the more insects there are, such as places near the urban-rural junction such as Changba.

Laodelphax striatellus is an important vector insect, which is not harmful to crops, but can spread many diseases. If it is not well controlled, it will cause devastating losses to crops. In recent years, rice stripe disease, black-streaked dwarf disease and maize rough dwarf disease are widely prevalent in Jiangsu Province.

Laodelphax striatellus does not harm people. Because of the cold and heat tolerance, adults will die quickly when the temperature exceeds 30℃. In addition, the life expectancy of adults is about 6 to 12 days, so the situation will basically improve by June 20.