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In this situation , the Qualified Applicator Certificate ( QAC ) holder must possess the Landscape Maintenance Pest Control category on their certificate , and obtain a Maintenance Gardener Pest Control Business License . This unprecedented provision , dubbed the " clear cut rider , " requires cutting of millions of acres of publicly owned trees that have in any way been damaged by fire , pests , or the weather . He takes an immeadiate liking to the family , but they're being pested by social worker Susan Sprague ( Madge Evans ) , who is trying to keep Patsy out of the orphange . However , these pests usually do not become severe . Applicants must provide proof of the minimum amount of experience ( as an employee of a registered California company ) in the particular branches of pest control in which they desire to be licensed . This will be accomplished by establishing an effective communication network between regional expertise , developing harmonized reporting protocols with the national diagnostic network participants , and cataloging pest and disease occurrence to be included in the national database . In addition , if at the time of treatment the commodity is owned by the grower and a packing house applies post-harvest fungicides with its own equipment and charges for the services , then the packing house is operating as a pest control business and must be licensed . When plants are under environmental stresses caused by compact soils , droughty conditions , or excess nitrogen , they are less able to combat pests and may be even more attractive to them . Booklet discusses meaning of " noxious weed " , how they are introduced , why they are " pests " , impacts on habitat and biological diversity , impacts on ecosystems , weed control methods such as chemical control , biological control , mechanical removal , and goat & sheep grazing . Monitor performances of Pest Management Professionals in test site . Additionally , licensing is not required of any individual as long as he / she holds specific categories covering the types of pest control being done even though the pests may coincidently be regulated pests .