TerraForums Venus Flytrap, Nepenthes, Drosera and more talk
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I'm not sure what would 'cause that in a ventricosa. But in my experience with lowlanders its caused by periodical drops in humidity, especially at night. Maybe you may want to check to see what your humidity is over the night.
Leaves can roll under from the tip. Or from the edges. Moisture stress causes them to roll from the edges. In severe cases the two edges might meet underneath the leaf. Giving the leaf the appearance of a straw. As noted, this can be caused purely by moisture stress. Either a sudden drop in humidity for a plant unaccustomed to it and/or too warm temperatures so that water is not replaced into the leaf fast enough to meet transpiration rates. Or perhaps not enough moisture at the roots, rotted roots preventing the uptake of sufficient moisture, insect damage sucking the moisture out of the underside of the leaf..
Basically just about anything where the leaf has experienced water loss faster than it can replace it. If it's only on a few leaves then probably nothing to worry about. Although I suspect your not really seeing true leaf curl from moisture stress if it is so few leaves and all the rest look healthy.
I recently had mites on a N. fusca of mine which caused leaves to develop smaller than normal and with the whole leaf curling downwards and sometimes towards the stem. Not only leaves with mites on them but any new leaves on plants affected by mites will experience this. Check the leaves (even the apparently unaffected ones) for brownish undersides and mite husks. If this is the problem, use an aracnicide.
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