Nematodes Soil and plant samples can be tested for the presence of nematodes which may be affecting plant health through root, stem or bulb infestation. To facilitate the testing process, please note the following guidelines. In summer, take care to ensure samples are kept cool in transit. Dig up carefully - don't pull up. Roots should be left in soil to keep moist and sealed in a plastic bag.
Dead plants are useless for identification.
Wrap the plant in paper and sealed in a plastic bag if sending by mail. B. Cankers Select specimen from recent infections. If possible send entire cankered portion with some healthy wood above and below the canker. Branches and twigs that have been dead for several months are useless for identification. C. Leaf Spots Collect leaves showing a range of symptoms from early to late stages of infection.