After inspection, the whole strawberry seedlings in the center of the picture are nearly dark brown and dull, the color of the leaf blade near the petiole is deeper, the outer leaf margin is relatively better, and the leaves of the whole plant are generally shrunk and partially damaged; in the upper right corner of the picture, See the plants with normal colors, but when you look closely, there is a dark leaf near the petiole.
Researcher Ji Muxiang, a research expert on strawberry diseases and pests in the Zhenjiang Institute of Agriculture and Science in the hilly area of ​​Jiangsu Province, viewed the picture and thought that the strawberry seedlings may have been damaged by the thrips. It is recommended that farmers check whether there are insects in the overlaps between the leaves of the strawberry and the worms. Small (0.5 to 2 mm in length), must be viewed carefully. From the picture, the victim's leaves presented with later symptoms, indicating that the damage to the horse has been very heavy, and it is necessary to use a combination of timely medication and hanging sticky swatches to prevent and treat it.
Affected by Thrips
According to Ji Muxiang's introduction, Hummer is one of the important pests that have harmed strawberries in recent years. Because of its tiny size and hidden dangers, it is not easy to be discovered in the early stages, and it often attracts attention when it is serious, but it is too late. In the process of strawberry production in Jiangsu Province, there are two peaks in the damage to the horse. First, from September to October after the strawberry was transplanted, adults and nymphs of thrips were mostly hidden in the young tissues of the strawberry, which mainly harmed the young leaves, causing the leaves to shrink and darken. In severe cases, the growth of the thrips was stagnant, and the growth was slow or even dead. Second, from March to May of the following year, the adult and nymph of thrips were mostly hidden in the flowers of the strawberry, mainly causing damage to the flowers and fruits, resulting in abnormal fruit and rough skin, affecting the quality. In severe cases, the flowers were wilting or falling off, and the flowers were not browned. . In recent years, due to the renewal and technical improvement of strawberry varieties, the differentiation of flower buds in strawberry in winter greenhouses has been advanced. In late November, the number of thrips has risen. If the control is not timely, the damage to flower stamens will be large and will affect the first batch of strawberry fruits in winter. In addition, some species of thrips are viral vectors that can cause viral diseases.
Suspending slime swatches in the strawberry field is an effective measure to prevent and control humming horses. From strawberry planting to harvesting, it also has an effect on aphids. The swatches are generally 30 cm long and 20 cm wide, 30-40 pieces per mu, and yellow, blue and other cross-distribution. The swatches should be suspended 20 to 40 cm above the top of the strawberry plants. When serious pests occur, the number of swatches should be increased. When the number of pests attached to the swatches is high, new swatches should be replaced or re-glued. In addition, timely removal of weeds from the fields and the remnants of litter, concentrated burning or deep burial, in order to eliminate some adults and nymphs. At the same time, the management of fertilizer and water will be strengthened to promote the growth of the plant. Insect nets are set in the field to block, and there are also certain control effects on the hummer.
In view of the strong concealment characteristics of thrips, the herbicides used to control strawberry field thrips should be selected to have systemic absorption or silicone additives, and the long-acting drug species should be selected before flowering and bud initiation. It is recommended that biological pesticides be preferred. For example, 60 g/l spinosyn suspension 1500 to 2000 times, or 40% flubendividin water dispersible granules 4000 to 6000 times, or 1.3% matrine water 1500 times liquid spray control. It is also possible to use low-toxic chemical pesticides, such as 50% of floxacillin water dispersible granules 5000 times, or 240 g/L of spirotetramat suspension 4000 to 5000 times, or 10% flonicamid water Disperse granules 1500 times, or 25% thiamethoxam water dispersible granules 5000 ~ 8000 times liquid spray, various drugs should be used interchangeably. Adult fleas can fly fast, spread quickly, and use drugs from the periphery to the middle to improve the concentration. At the same time, according to the characteristics of humming horses, use afternoon medication. Can be fumigation control in the greenhouse after shed, per acre with 10% isoprocarb smoke 250 to 300 grams, 8 to 12 points, lit in the evening, closed overnight fumigation. After the bees are given, care should be taken to protect the bees and they must be moved out of the greenhouse for more than 3 days.
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