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Disease Diagnosis
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We diagnose prevalent diseases in trees, vines and various crops using
PCR and ELISA. These are proven methodologies that provide fast and
accurate diagnosis of common plant pathogens: fungi, bacteria,
phytoplasms and viruses.

What analyses do we provide?

    We can test for the presence of a wide range of pathogens, such
    as anthracnose, Alternaria, and scab in almonds, or Fan Leaf
    Virus, crown gall, Xylella and vine decline in grape. We are
    continually expanding our services to cover other trees and field
    crops such as rice.

    Please Contact us for the specific tests you need.

How to submit samples for analysis?

    Follow these steps:
  1. Follow a sample collection procedure as suggested (see
  2. Label each sample to uniquely identify it – Download 2x4
    Labels. Print them on standard 2x4 inch label stickers (10
    to a page);
  3. Enclose in each shipment the submission form(s)
    describing the samples and tests desired -- Download
    Submission Form.
  4. Enclose your payment for the analysis fee.

    In the submission form list every sample you are sending.
    Enclose one or more submission forms in each package. Number
    the forms sequentially.

    At least one submission form should identify your company’s
    name and address, in addition to your contact and payment

    Please, include a graph of your collection scheme (see below).

    Keep samples cool. Avoid moisture in your shipping container.
    You may include multiple samples in a shipment.

    Mail freshly collected samples early in the week, preferably by
    overnight carrier.

How should samples be collected?

    Successful testing requires an appropriate sample collection,
    labeling and handling strategy. Please follow these instructions.
    If there are still unanswered questions, do contact us.

    It is important for us to know what type of samples you are
    sending, such as “young, 1-2year old stems”.

    Provide more than one suspect sample to minimize the possibility
    of tissue sampling error

    Ideally, along with a diseased suspect plant material, submit also
    healthy and positively diseased material. These can provide the
    negative and positive controls in our test.

    It is essential to handle these materials as aseptically as
    possible to avoid cross-contamination. Collect one sample at a
    time: first the healthy one, then the suspect and lastly the
    diseased one in that order. Use a large zip-lock freezer bag
    (turned inside out, worn as a glove), one bag per plant.

    When sampling a block with disease, it is recommended to test
    multiple plants showing several stages of symptoms, from mild to
    severe, as well as some plants that are symptom-less but in
    proximity (see next figure).
Sampling around disease plant illustration
    For each plant, collect several plant tissue samples, such as: 5-
    10 leaves, leaves, twigs or spurs showing symptoms and located
    in transition zones between healthy and diseased plant areas.

    Follow a sampling scheme starting from a remote healthy-looking
    plant (the ‘Reference’ in the submission form), moving then to
    suspect plants neighboring diseased ones, and lastly the
    severely diseased.

    Bear in mind that foliar symptoms (chlorosis, leaf drop, wilt) can
    be due to trunk or root rot. If in doubt, these woody tissues
    could be separately sampled and bagged for testing.

    Do not send dead tissue or samples derived from dead plants,
    already decomposed by secondary pathogens.

    For routine monitoring and early disease detection in a block,
    one of the following schemes can be followed.
Zig-zag sampling illustration
Random diagonal sampling illustration
Further questions?

Please Contact us for further information.
Vineyard over rolling hills
Diseased grape leaf

Site Map
Services Summary

Olive Oil Chemical Analysis

Olive Oil Sensory Analysis

For Growers and Mills

Variety Identification

Disease Diagnosis
2692 House Ave
Durham, CA 95938
Phone/Fax 530-924-4789

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Inc.  All rights reserved.