1. Remove the fluid knob at the rear of your spray gun. 2. Remove the needle spring. 3. Squeeze the trigger. This will push the needle assembly back far enough for you to grab with your fingers.

WEST LAFAYETTE, Ind. - A cool, wet spring may put corn planted in sandy soils at greater risk of attack by the destructive needle nematode, Purdue Extension nematologist Jamal Faghihi says. Nematodes ...