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The best way of using a plastic tree guard is to remove it for the growing season and put it back on in fall . Plastic tree guards are not a perfect solution , however . However , current orbital systems are not designed with interferometry specifically in mind and lack the technology to provide the requisite data . If you use plastic tree guards , make sure they are pushed down into the soil to a depth of two inches . Unlike many other plant pathogens that have narrow host ranges , foliar nematodes , particularly Aphelenchoides fragariae , have broad host ranges and are capable of infecting hundreds of species of plants . Knowledge of antenna baseline length B and orientation implies accurate knowledge of the orbital parameters of the spacecraft and spacecraft orientation during each image acquisition . Southern blight can be confused with white mold ( Sclerotinia sclerotiorum ) , another fungus with a broad host range that produces white , cottony mycelia . Like a plastic tree guard , it should be pushed into the soil to prevent entry of voles . Because of the broad host range of this pathogen , it is recommended that plants be well spaced to allow foliage to dry between waterings . Since earthquakes do not recur with sufficient frequency to acquire the necessary data in a single location , we must resort to what might be termed an " ergodic " hypothesis and study earthquakes worldwide , with the idea of recognizing patterns associated with broad sets of geological and tectonic circumstances , which presumably apply to other similar areas . One type of tree guard is a plastic spiral . In the future , it is likely that orbital SAR systems will be specifically designed to facilitate acquisition of interferometric data , and thus will include GPS and other tracking techniques to provide accurate information on the position and orientation of the platform . Massonnet et al. ( 1993 ) tested a number of satellite passes before finding two with optimum characteristics , then adjusted the orbital parameter estimates to minimize coseismic offset far from the fault . In addition to broad host range , there are few effective nematicides labeled for home use . However , evidence indicates that some pear varieties may be self-fruitful under some conditions , and you might be able to get a small amount of fruit with only one tree . A soil-borne fungus ( Verticillium albo-atrum ) causes this disease .