Seeds Pests and diseases
There are several hundred thrips or fringed winged species (Thripidae). The newly hatched, wingless nymphs go through several stages of development until they are fully grown and their fringed wings are pronounced. They like warm and moderately humid environments. That's why they especially love indoor cannabis grows.
With their sharp suction trunks, fringed wings suck the sap from the plant tissue. They usually damage the hemp leaves, but can also affect flowers. As a result, the plants are covered with small bright and even silvery spots. These are similar to those of spider mites, but are significantly larger.
The first signs of a fringed winged bird infestation are often the appearance of silver spots. If you discover them, you have to carefully check the infected leaves from both sides. Mostly one can find clearly visible, bright, wingless nymphs, about one to one and a half millimeters long, which move quickly. The adult specimens with wings are usually darker.
Intervention at an early stage can be very helpful in combating fringed winged birds, which is why the plants should be checked regularly for indoor grows. Another simple prophylaxis is to cover the grow medium as the fringed winged nymphs have to pupate in the ground, which prevents them from doing so.
Fringed winged birds have several natural enemies, such as ladybirds and lacewings or, above all, the predatory mite Amblyseius cucumeris and the parasitic nematode Steinernema feltiae. Neem oil can also help. However, if the fringed-winged birds have already penetrated the plants, you usually have no choice but to bring out the heavy artillery, i.e. any chemical from the gardening trade.