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A number of the spots may run together so that the leaves appear irregularly blotched . Without a collective consideration of all the documents , the examiner may not have been able to make an association . At 55 degrees or less , plants may be infected without the symptoms being obvious . The spots may become clear and after several weeks the affected tissue drops out leaving small holes . The symptoms of foliar nematode damage are due to the nematodes ' feeding on the foliage , stems and buds . The cells eventually erupt , then the spots turn yellow , brown , brownish-red , or even black . The symptoms of blight caused by this fungus , Phytophthora cactorum , may be confused with the symptoms produced by Botrytis sp. The documents should be handled with cotton gloves . With respect to the eradication of the impressions , 85 percent of the documents examined contained evidence suggesting that there was an attempt to eradicate the impressions . Some attorneys are willing to spend a lot of time in getting ready for the handwriting evidence phase of the trial ; others are less likely to want to devote much time to it . Fortunately for the examiner , a thorough examination and comparison of all the documents revealed many recurring individual and class characteristics regardless of the writing medium or surface involved . The spots eventually turn gray and develop red-brown borders . Sometimes the spots may be mistaken for fungal rust , but these are not signs of a contagious disease . Inspect all new plants and their associated soil carefully for the symptoms and signs noted above . Any necessary identifying marks on the documents should be made in pencil . These nematodes are microscopic worms that seek out and kill the caterpillars by introducing a bacteria .