Pests on rose flowers and their control
As the "queen of flowers", roses often cause their leaves to wither and their flowers to be deformed due to insect attacks. This article will systematically analyze the characteristics of 6 common insect pests and provide scientific prevention and control solutions to help you create healthy flowers. Rose spider mites double threat to red spiders. Tetranychus cinnabaris and Tetranychus ermaculatus form a combined offensive. The back of the leaves is densely covered with insect bodies, causing the leaf surface to appear star-spotted yellowing. In severe cases, the insect population coverage reaches more than 80%. The best prevention and control time is early spring germination period, and the stone sulfur mixture needs to be diluted to 3-5 degrees Celsius in Baume and sprayed. The introduction of predatory mites (such as Phytoseius microchili) in new biological control solutions can achieve ecological control. Combined with weekly leaf back water spraying to increase humidity, the insect population density can be reduced by more than 65%. Rose aphid clusters harm the growth rate of aphids during the young shoot period in spring is alarming. A single female can lay 50-100 eggs. It is recommended to use imidacloprid (10% wettable powder 2000 times liquid) and matrine (0.3% aqueous solution) alternately to avoid the development of drug resistance. Insect pests caused by rose thrips that invisible damage to rose flowers and their control
The harm of thrips is concealed, and its nocturnal activity makes it difficult to detect. Blue plate trap combined with thiamethoxam (25% water dispersible granules 8000 times liquid) can increase the prevention effect to 92%. Rose leaf peak gluttony crisis larvae enter the gluttony period after 3rd instars and can chew 5-7 mature leaves within 24 hours. It was found that cypermethrin (1500 times 4.5% emulsifiable concentrate) was sprayed immediately in the early stage, focusing on treating the folds on the back of the leaves. Sexual traps should be set up to prevent and control rose stem wasp drilling during the emergence period of adults in April. When the boring channel exceeds 15cm, systemic detergent should be used to irrigate the roots. Pay attention to 45° oblique incision when trimming to avoid secondary infection caused by stagnant water. Countermeasures for locust grazing on roses in winter, deep plowing the soil destroys egg masses. Spraying fenthion during the nymph period in May requires the addition of an organic silicone additive to allow the liquid to penetrate the waxy layer. Simultaneous removal of surrounding gramineous weeds can reduce the source base of insects.
By combining insect monitoring, chemical control and ecological control, and monthly application of seaweed fertilizer to enhance plant resistance, a three-dimensional protection system can be established. It is recommended to establish a control log to record the time and effect of each application to provide data support for control in the coming year.