Mango Haze Seedling Health Problem

[Dexter]

If its not a virus then the only other thing Ive seen do something like that would be a toxicity of less mobile secondary and trace elements [ Sulfur, Iron, Manganese, Copper, Zinc, Boron, Calcium ] toxicity or lockup is going to show in new growth shoots and near the top.

I forgot were these plants like this from seedlings or did they develope the problem?

Heres some more info on cannabis viruses.

Viruses rarely kill Cannabis. They only exist and replicate in living plants. Viruses can, however, seriously reduce yields. Once acquired, they are nearly impossible to eradicate. Viruses invade all parts of plants. Pollen and seed infections transmit viruses to subsequent generations.
Five viral syndromes are described in the literature. In addition to these naturally-occurring infections, Hartowicz et al. (1971) screened 22 common plant viruses for their ability to infect wild hemp. Over half the viruses could infect Cannabis.
The hemp streak virus (HSV) is frequently cited on fiber cultivars in Europe. Foliar symptoms begin as a pale green chlorosis. Chlorotic areas soon develop into a series of interveinal yellow streaks or chevron-stripes. Some-times brown necrotic flecks appear, each fleck surrounded by a pale green halo. Flecks appear along the margins and tips of older leaves and often coalesce. Streak symptoms predominate in moist weather, flecks appear during dry weather. Leaf margins become wrinkled and leaf tips roll upward, leaflets curl into spirals. Whole plants assume a "wavy wilt" appearance.
The hemp mozaic virus has been described on fiber cultivars in Europe and drug cultivars in Pakistan. Symptoms were described as a gray leaf mosaics. Three other viruses have been cited on European hemp—the alfalfa mozaic virus (=lucerne mozaic virus), cucumber mozaic virus, and the arabis mozaic virus. Many insects transmit these viruses as they feed from plant to plant. According to Ceapoiu (1958), the worst vectors of Cannabis viruses are bhang aphids (Phorodon cannabis), greenhouse whiteflies (Trialeudodes vaporariorum), onion thrips (Thrips tabaci) and green peach aphids (Myzus persicae).

http://mojo.calyx.net/~olsen/HEMP/IHA/iha03111.html


I found one website [ in spanish ] that had pictures of the hemp streak virus where it looks like it effected an otherwise healthy plant. Somewhat similar but not exact. I wonder what it might look like effected from seed?

http://www.sinsemillast.com/marijuana/145/enfermedades-de-la-marihuana-el-virus-hemp-streak.htm

Heres one of the better pages I found with pictures on the various mosaic viruses.

http://comp.uark.edu/~morelock/cowpea_virus.html

Leaf infected by a `mosiac` virus.

 

[shantibaba]

Hi All

it looks like a few of you need to take over my job!

Anyhow after reading through the thread and looking at the photos I know this problem as it is not new to me.

We have seen this even on a cloned growing plant nearing flowering, so it is either a virus, viroid or pathogen/bacteria related problem. Considering it will eventually affect plants in its vicinity I would be more inclined to directly kill it or separate them into isolation.Treat it as a virus and do not take clones from it as it will be difficult to rid the symptoms entirely.My philosophy is to kill all plants that do not fit into natural selection...fit survive, rather than try to find something positive from infected plants. The risk increases as the plants foliage thickens and air circulation plus humidity are transport methods to be aware of.

It is not only seen in Sativa dominant plants but hybrids are also susceptible to be infected.

What are you planning on doing L33t....? Keep us informed and I must say very happy to see such well researched responses on this thread.Heads up!

All the best Sb

 

[L33t]

Hi Dexter and Shantibaba.

Thanks for the replys.

I will treat them as a viral infection like you suggest just to be sure , either isolate the affected plants or kill them but I was wondering ..do you think there is any chance it could be ph related problem or something other than viral/bacterial prob ?

I ask this cause the problem seems to have stopped spreading , or at least it has 'slowed down' , has not affected new growth much if any at all .
If it is a virus/pathogen/bacteria , can the problem be transfered even if the affected plants are moved in a nearby room in the same property via air or is it only by touch ?

If I move em/isolate them I will not take clones from these plants but I was also wondering could it be of any help if the damaged leaves were removed ?
But I will most probably throw em away cause I wouldnt want to take any risks.

Here are the 3 affected female plants ( the rest 2 which were males and showed more symptoms have been tossed ):

 

[Dexter]

Seems to be improving somewhat, like enough of the uneffected areas are able to do their job.