As of 2015, Amazon’s most highly rated tree/lawn sprayer is the Chapin 20000 1-Gallon Poly Lawn model, which has an average of 4.5 stars out of 1,856 reviews and costs $9.42. It features a 1-gallon tank, an anti-clog filter and an ergonomic pump handle.
To cover larger areas, the highest-rated backpack tree/lawn sprayer is the Chapin 61900 4-Gallon Tree/Turf Pro Commercial Backpack model, with an average rating of 4.0 stars out of 531 reviews and costs $79.99. This model features a 4-gallon tank and a removable three-stage filtration system. It also has a stainless steel wand with pressure gauge, as well as a three-piece nozzle set.