Continue using biologicals to prevent pest carryover to your next crop.  If pest populations increase at the end of a crop cycle, there is a greater chance that a number of those pests will re-appear on you new crop.  The best clean-out job cannot rid a farm of diapausing spidermites and pupating thrips.

Clean Up

• Remove all plant material and debris.  Clumps of dirt and plant debris can protect plant pathogens from disinfectants.
• Properly dispose of any contaminated plant material.  Dumping infected plants in the vicinity of your greenhouse may lead to infection of your new crop.
• Remove weeds, strings, and growing media.
• Clean the structure, floors, walls, and roof.
• Raise the heating pipes to clean beneath them.
• Wash everything with a disinfectant.
• Use oil to kill insects and mites hiding in cracks, along the post lines, along walkways and around pipes.
• Clean out your irrigation lines and check for build ups and blockages.  Use acid base formulations for fertilizer, calcium, and mineral build up and use chlorinated formulations to clean out algae.  After using acid formulations, it is important to rinse your lines with clean water to prevent the formation of poisonous gases.
• Heat and vent before planting to avoid residual chemicals from burning your plants when you turn on the heat.

TIP
Before planting, put 4 bean pots per acre in your greenhouse.  The plants will act as a magnet and attract any carry over pests.  Dispose of the plants before planting, or, if clean, move the plants to the walkway so they can continue to lure unwanted pests.