white patches
 

hello! hope someone can help with some problems on my dendrobiums. my first problem belongs to picture 1 and 2, are 2 different dendrobium orchids it´s a white area in only one leaf on every orchid, it´s very thin and it happens in no more than 24 hours. the day defore I spray them with a product for ants, so i´m not sure if the product did that. my city has a warm weather even at night.

my second problem is picture 3 and 4. in many new growths of many dendrobiums I can see that pattern on the leaves that are like white lines but the orchid looks healthy, it´s a disease or can be lack or vitamins?? or sunlight???

Well, pic one looks like sun burn or the leaves got too hot. Pic two looks like the same with perhaps some cellular collapse. Not an expert in this, but I would think it may have been under watered and not able to cool itself enough.

Pic 3 & 4 both appear to be early signs of being too hot or sunburn to my eye.

Hope someone else can chime in if Im wrong.

Agreed, sunburn.