The insect pest of Silver Star-root mealybug
When abnormal conditions such as rotten roots and withered appear in Silver Star, most growers first suspect excessive watering, but often ignore the potential pest threat. This root mealybug pest unique to succulent plants is characterized by strong concealment and rapid spread, and requires systematic prevention and control to save the plant. In the early stage of symptom recognition of the silver star root mealybug, the white flocs on the inside of the basin wall are an important warning signal. At this time, waxy secretions have been attached to the surface of the root system. As the insect population expanded, 0.5-1mm oval white insect bodies gathered at the junction of the rhizome and roots. Severe harm means that after the root absorption function is completely lost, the plant appears dehydrated wilting, and the stem base appears transparent and rotten. If not treated in time at this time, the mortality rate of the entire plant will reach more than 80%. Systematic control plan for root mealybug physical treatment three steps 1. Remove the basin and wash the roots: Rinse the roots with warm water at 30℃, focusing on removing white powder between the root hairs. 2. Root pruning: Cut off lignified old roots and decaying tissue, and retain healthy main roots. 3. Disinfection and drying roots: Dry in a cool and ventilated place for 2-3 days to promote wound healing. Silver Star insect pests-medium treatment plan for root mealybug Old soil must be sterilized at high temperature: put it into a sealed bag and heat it with microwave for 3 minutes (700W) or pour it in boiling water. Let stand for 24 hours. It is recommended to replace new granular soil and increase the proportion of red jade soil to 40% to improve air permeability. Drug Guidelines for Chemical Prevention and Control·Suqil emulsifiable concentrate: irrigating roots with 1500 times liquid, 3 times in a row for 7 days·Aiqus emulsifiable concentrate: Double-effect treatment on leaf surface + irrigating roots, focusing on spraying on the base of stems·Preventive medication: Use imidacloprid every quarter to irrigate roots with 2000 times liquid to control the silver star mealybug needs to follow the principles of "early detection, rapid treatment and strict prevention." It is recommended to establish a maintenance log, check basin soil moisture and root status every month, and cooperate with preventive medication in spring and autumn to reduce the risk of recurrence by 90%. Healthy plants should have a compact rosette shape with full leaves with silver-white powder frost.