Pesticide duster attachment for portable blower

A duster for a source of vacuum, said duster including an upwardly opening container having a bottom wall provided with a central opening formed therein, an upstanding vacuum tube including a lower outwardly opening outlet end secured to said bottom wall about said opening and an upper inlet end spaced at least appreciably above said bottom wall, an upstanding pilot tube having upper and lower ends, transverse plate means disposed in and loosely slidable within said container toward and away from said bottom wall and having a central opening formed therethrough about which the lower end of said pilot tube is secured to said plate means with said pilot tube loosely telescoped downwardly over said vacuum tube and the upper end of said pilot tube projecting above the upper end of said vacuum tube, the upper end of said pilot tube being at least substantially closed and the upper end of said vacuum tube including air flow controlling means operatively associated therewith for controlling the amount of air admitted into the upper end of said vacuum tube, a variable volume area of the interior of said container disposed between said plate means and said bottom wall being adapted to receive fine, granular dusting material therein, said outlet end of said vacuum tube being adapted to be communicated, with at least a portion of the air intake of a blower assembly including a pressurized air outlet through which air having predetermined amounts of dusting material entrained therein may be discharged from said air outlet.