hemp mosaic virus

Hemp mosaic virus

Sunn-hemp Mosaic Virus (SHMV) – DAS ELISA Home Products Testing Services Supplies Contact Us

Catalog #: V138
Source Antibody: Rabbit polyclonal antibody for both capture and detection.
Test Format: DAS ELISA

Reactivity: The test reacted with all SHMV isolates tested. Reaction of the ELISA is moderate strong. Optical Density at 405nm is in arrange of 1.000 – 1.500 depending on the virus titer in the samples tested.

Sensitivity: Sensitivity of the ELISA is very high. The virus can be consistently detected in infected plant tissues diluted at 1:810 – 2430.

Specificity: There is no cross reaction with healthy plant tissues such as tobacco and tomato. Background is low on all of the negative control wells.

Application: The test can be used to detect SHMV in infected host plants.

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Information About the Virus

Name: Sunn-hemp Mosaic Virus
Acronym: SHMV
Synonyms: bean strain of tobacco mosaic virus, cowpea strain of tobacco mosaic virus, cowpea chlorotic spot virus (Sharma and Varma, 1975; Varma, 1986), cowpea mosaic virus (Lister and Thresh, 1955; Kassanis and Varma, 1975), cowpea yellow mosaic virus, Crotalaria mucronata mosaic virus, dolichos enation mosaic virus (Capoor and Varma, 1948; Kassanis and Varma, 1975), sunn-hemp rosette virus (Varma, 1986; Verma and Awasthi, 1976; 1978).
Group/Genus: Tobamoviruses

Vector: Transmitted by means not involving a vector.
Transmission: Virus transmitted by mechanical inoculation; transmitted by contact between plants; probably transmitted by seed; not transmitted by pollen
Main host plants: Crotalaria juncea, Lablab purpureus, Vigna unguiculata, Mucuna aterrima.

Virus Infection: Symptoms persist with systemic mosaic, mottling, stunting.

Hemp mosaic virus Sunn-hemp Mosaic Virus (SHMV) – DAS ELISA Home Products Testing Services Supplies Contact Us Catalog #: V138 Source Antibody: Rabbit polyclonal antibody for

Tobacco Mosaic Virus – How To Protect Your Cannabis Plants

Tobacco mosaic virus (TMV) is a virus that was first identified in tobacco crops, but can impact other plants, including cannabis. While it cannot hurt the grower, it can significantly deform plants and lower yields. There is no cure. Here is how to spot it and what to do if you have infected crops.

Tobacco mosaic virus, as the name suggests, is a virus common to tobacco plants. TMV causes splotchy and twisted leaves, leaving a strange mottling or mosaic pattern in its wake. It can also slow growth and reduce yields. TMV was the first plant virus to be discovered.

Worse, TMV appears to have spread to other kinds of plants. These include tomatoes, peppers, eggplant, spinach, and marigold. It also appears that cannabis is susceptible to TMV. And although TMV cannot hurt the grower, it can prevent your plants from being successful.


Plants with TMV have a very distinctive look to them. Leaves will be twisted and curved in ways unnatural to the plant. The leaves will also feature yellow stripes, spots, and a strange mottled, mosaic pattern.

Symptoms can be observed on several leaves or on just a few. Some plants are just carriers and never display symptoms themselves. It is also easier to see the leaf mottling if the affected plant is partly in the shade.

Specific visual cues that your plants have been infected with TMV include:

  • Strange leaf colour: Brown leaves with “burnt” edges, pale or yellow stripes in old and new growth, and dark purple or black patches are one sign. So is the yellowing of the leaves between the veins. A mottled, mosaic pattern is a major mark of TMV.
  • Stagnation in growth: Both old and new growth can be affected by TMV. If you plant appears not to be growing as it should be, it could be that TMV is slowing it down. Wilting is another possible sign of TMV infection, as is slowed root spread.
  • Abnormal growth: Leaves grow in a strange, twisted pattern. They also appear webbed, curling under or upwards in odd ways.
  • Strange Stems: The stems can be either significantly weakened or appear in strange colours like red or purple.
  • Anaemic buds: Your buds will not get nice and fat, but will stay small.


So far, the incidence of this condition have not been proven – only reported – in cannabis plants. However, the news is not good if you suspect your plant has become infected. There is no cure. An infected plant will have TMV forever. Your main goal, in other words, is to find the infected plants and remove them from the grow. TMV appears to spread via contact. As viruses can also be present in pollen and seeds, they can live for a long time in a grow room. They can survive on grow room equipment, carpets, soil, and dead plant matter.

That is why it is also essential to immediately quarantine and remove any plant you suspect is infected, pronto. Be sure to fully sanitise all grow room surfaces of any TMV traces before starting your next grow cycle.


If you smoke cannabis or tobacco, you run the risk of carrying the virus on your hands. As such, it is a good idea to always wash your hands before coming into contact with any plants.

TMV was the first plant virus discovered. It is now clear it can affect cannabis plants too. Here is what to look for.