Symptoms: Squash mosaic disease is caused by two viruses. It is very difficult to judge the pathogenic virus only from the disease. Western varieties and Japanese varieties of pumpkin, the pathogenic virus is different. Western squash is caused by two viruses, while Japanese squash occurs, most of them are WMV infections. In WMV-infected plants, the leaves were dark green along the veins, other parts were pale green, and the leaves and fruit were deformed. On the other hand, in the CMV, yellow spots were observed on the leaves near the growing point, and the spots were patchy or deformed.
Pathogens: Both WMV and CMV are transmitted by aphid vectors. Wheat aphids prefer green and yellow. The WMV host area is small, there are no plots of host crops in winter, and few diseases occur in spring. Cultivating cucumbers in greenhouses in winter can form infestation sources. It is more common in summer and autumn. WMV can also infect by sap, especially through scissors. The host range of CMV is wide, and many winter seasons are also caused by infected plants. In the spring, when locusts begin to move, their incidence increases.
Control methods: Once the virus is infected, it is difficult to control it with chemicals. Therefore, care should be taken to prevent vector locusts. Straw mulching will attract locusts and should be replaced by mulching. In addition, green and yellow tapes can be hung in human sheds to kill locusts. Http://
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