White spots on the cactuss

White spots on the cactuss

Question: white spots on the cactuss


Hi can you tell me I am and how can I defeat the white spots that are forming on my two cacti

Answer: white spots on the cactuss


Gentile Gaetano,
white spots on the cactus, light white, may be due to the presence of insects, for example the cochineal; this insect develops in a particular way in the greenhouses, or on the cacti that are kept in the apartment, because it loves the climatic conditions characterized by high temperatures, and poor ventilation. The small insects gather in colonies, covered with a waxy or sticky substance, which prevents common insecticides from reaching the animals; for this reason, against cochineal, it is necessary to use specific insecticides. If the cactus is small, or insect spots are few, it is possible to remove them with a cotton pad soaked in alcohol, which has the dual function of dissolving the waxy coating on insects, and of disinfecting the bites that scale insects practice on the epidermis of the plant, from where fungal or bacterial diseases can enter. If, on the other hand, it is a large plant, or many insects, then you should use a product based on white oil, or mineral oil specially formulated for use in agriculture and gardening: temporarily move the cactus to a semi-shaded place , so that the product you vaporize on the stem does not act as a lens, causing burns. Typically, scale insects grow in areas that are not very visible, between the areolas, at the base of the plant, between the ribs, and even between the roots. To prevent the presence of these insects on the roots of the plant, you can also use special insecticides in tablets, which are immersed in the earth of the pot, and dissolve each time you water, entering the plant in a circle; obviously looking for a product that is against cochineal. If the light spots are not soft and sticky, but stiff and with the appearance of dry paper, then it could be a problem due to the brightness your plant receives; many succulent plants and cacti love to be in full sun, but if they have spent the winter in a semi-shaded place, or at home, it is advisable to move them in full sun gradually: at first only in the early hours of the morning, and gradually more and more to long; otherwise you risk that the sun's rays burn the thin skin of your cactus. If you kept it in the apartment this winter, it has adapted to living in conditions of poor brightness, so before you can have it exposed to the sun you will have to get used to direct sunlight.