For chemical control to spray on the tree crown with 2.5% Dishasi in dilution of 1 :96 000,or with 20% Sumicidin in dilution of 1 s 40 000,or with 25% Sevin in dilution of 1 :9600 is effective to kill the nymphs before 3 instars (during the late May).

• 药剂防治；若虫期防治效果最好.；3龄前(5月末)；喷布2