Method for controlling thrips using stratiolaelaps scimitus during float-tray-based tobacco seedling cultivation

A method for controlling thrips using Stratiolaelaps scimitus during float-tray-based tobacco seedling cultivation, comprising the following steps:

• 1) arranging a seedbed in a wind-sheltered sunny area with upwind positioning, and removing host plants of the thrips around the seedbed;
• 2) sowing 2 tobacco seeds per cell in float trays for the float-tray-based tobacco seedling cultivation, arranging 32 float trays per nursery greenhouse, placing the float trays in a nutrient solution tank, adding a formulated fertilizer solution for the float-tray-based tobacco seedling cultivation into the nutrient solution tank, arranging a plurality of nursery greenhouses in close proximity to form a nursery greenhouse cluster, erecting a plastic film vertically around the nursery greenhouse cluster, and arranging an insect-proof net around the nursery greenhouse cluster;
• and
• 3) after a rate of seedling emergence reaches over 90%, thinning seedlings, and on the following day, releasing the Stratiolaelaps scimitus into root soil of plants in the float trays at a rate of 4-12 mites per cell, followed by standard seedling management until transplanting of the seedlings.