With high temperatures and drought, the weather in these two days is not comfortable. However, when the reporter visited the reporter recently, he discovered that some of the plants that had been gradually blossoming in June, such as oleander, water lilies, and Guangyulan, have now become enchanting. However, the high temperatures in recent days provided conditions for the propagation of some insect pests. The transfer time of adult S. graminifolia was much earlier than that of the past, and the number of cabbage butterflies also showed an outbreak, which directly threatened some cruciferous vegetables. Experts reminded farmers and farmers to do a good job of pest control.
Oleander, water lily, etc.
The oleanders in our city are mainly concentrated in the areas of Youyi Road and Jiangyang Road. In Jiangyang Road, the yellow oleander in the green belt stretches horizontally. The height of the oleander is already high. The oleander flowers here are mostly pale yellow, some are in full bloom, and some are completely in full bloom; and Youyi Road The oleander color is mostly pink, and it grows very lush, becoming a unique landscape at high temperatures.
“The high temperature weather has a great influence on flowers. The most obvious is that the flowering period of some flowers is advanced.†Professor Xiaodi Xiao of the School of Planting and Planting of the Yangda Park introduced that in addition to oleander, pomegranate, privet, broad magnolia and water lily And other flowers have entered the blooming period. Yesterday afternoon, the reporter observed along Runyang Road. In the road isolation zone, the blooming Magnolia trees can be seen everywhere. The large white magnolia flowers in the green leaves are beautiful.
"Pomegranate on the streets of Yangzhou is relatively rare, and the public can watch it in the West Lake Garden." Professor Ho said.
“The two days of high temperature are not good for wheat.†Experts said that the current wheat filling period is basically over. It is the critical period for the number of grains and 1000-grain weight. "High temperatures cause dry air in the following days, which will make wheat 'premature'."
Laodelphax and Pieris active period
“The high temperatures in these two days will probably cause the Slugs in wheat fields to shift to Putian in advance.†Zhu Shude, a professor at the School of Horticulture and Plant Protection at Yang Da University, said without hesitation: “From the statistical point of view, this volume is larger than the same period of last year. ."
Zhu Shude introduced that the hosts of Laodelphax striatellus are a variety of turfgrass and rice, wheat, corn, alfalfa and other grasses, so it is harmful to agriculture. "In general, the nymph of Laodelphax striae will emerge from late May to mid-June. Under high temperature conditions, the time of emergence of nymphs is advanced. Most of the current wheat fields are winged hoppers." The quail first harms the wheat, and after emergence, it flies to Putian. After the seedling is inserted into the field, it is transferred to Daejeon. "In order to prevent pests from harming the seedlings, it is best for farmers' friends to use a shade net above the seedlings."
Some attentive citizens have discovered that in the past few days, there have been many scenes of white butterflies dancing in many parts of the city. This phenomenon is even more prominent in the wild. In Zhu Shude's view, this phenomenon is also worth worrying about. This white butterfly is actually a cabbage butterfly and is not harmful in itself. However, its larvae are 'famous' cabbage caterpillars, which will cause harm to some cruciferous vegetables. According to reports, cruciferous plants can synthesize higher concentrations of mustard oil. Cabbage butterflies have chemotaxis on mustard oil, so eggs will be produced on the leaves of cruciferous plants. Therefore, cabbage caterpillars are also concentrated in crosses. Flowering plants on leaves.
Professor Zhu said that compared to the same period of time, the current damage of Pieris has been more serious, "If the hot weather continues, the cabbage caterpillar pests will erupt in advance." To prevent pests, vegetable farmers generally apply pesticides on vegetables, "therefore, the public When buying vegetables such as green vegetables, cabbage, cauliflower and other cruciferous vegetables, care should be taken to eliminate pesticide residues."