White moth-like flies fly out of the plants when disturbed. Cottony material is found on the leaves and stems. Woolly, white insects with waxy coverings suck sap from leaves and stems. Leaves may be shiny and dry. Use Malathion .
Flowers buds drop off.
Too much water or high temperatures. Improve drainage when soil is too wet. In overly high temperatures mist the plants in the morning and mulch the roots to keep them from drying out. To prevent this use only sterilized soil. Seedlings topple over as rot affects stems at soil level.