If you notice the lower leaves (especially the oldest leaves) are turning yellow, go ahead and feel the soil. Or is it something else? Monstera brown spots can either be caused by excesses and/or deficiencies in certain factors. Host plants include onions, beans, carrots, squash and many other garden vegetables, and many flowers, especially gladioli and roses. Thrips feed on vegetation and often enter a structure when residents bring in infested plants by mistake. This climbing evergreen is a popular easy-to-grow houseplant and a favorite of many interior designers for both residential and commercial spaces. You see, plants that are damaged release hormones into the air that say ‘AAAAAAH I’M DAMAGED HAAAAAAALP’. About Thrips on Houseplants. Thrips are tiny and hard to spot until after they cause damage to the plants they feed upon and their fecal matter deposited on the leaves of their host plants is noticed. Monstera leaves with brown pots may also appear necrotic. I have a monstera adansonii that I think has damage from a pest attack that might be thrips? Why is my Monstera getting yellow leaves? plantladylin said:Hi EmelieG, Welcome to the site! Or is it a variegation mutation (I wish?) Thrips (Order: Thysanoptera) Thrips are technically a less common insect pest, but I've found that they are most prevalent in my household. Alas, … Thrips are likely to cause minimal damage unless the larvae get in to a freshly growing leaf, where they can cause quite a bit of "leaf mining" damage. Probably the most common reason your Monstera leaves are turning yellow is from the soil being too dry. An interesting fact: whether you have 1 or 500, you still call it/them thrips. BUT they can be managed with diligence. Thrips on indoor plants are not as common as thrips on outdoor plants, but they do occur and it is important to take care of them before the damage becomes too difficult to deal with. Thrips. Thrips are teeny tiny, just like spider mites, making them almost impossible to detect until the damage has started or is well on its way. Extremely active, thrips feed in large groups. Damage. Sadly thrips are difficult to eradicate once they have taken hold of a plant. Banded palm thrips (Parthenothrips dracaenae) Occurs all year round on various glasshouse and houseplants, especially those with relatively tough leaves such as Ficus, Dracaena, Citrus, Monstera, Schefflera and palms. If your soil has gone too dry (completely dry), the oldest leaves will turn yellow first. I found what I thought looked like thrips about 2 weeks ago so I've been giving it a bath every 4-5 days and spraying it with neem oil. 11. The pests seek out water and may also travel indoors via damp laundry. The size is either large or small depending on the nature of the damage it brings on the surface of the leaves. There is no singular. Like any pest, it is best to identify them early in order to have the best chance in getting rid of them. Ritual washing of the leaves keeps their damage at bay, and plants also like it. Ok. You guys are reassuring me about the damage on the leaves. Thanks again in advance! Just like the other pests, there are many different types of thrips. They leap or fly away when disturbed. A lot of pests LOVE new growth and are attracted to it, but also if the new growth is damaged, pests that are attracted to damage (hey, thrips) rock up. Native to the rainforests of Central America, the Monstera deliciosa plant is also known as the "tropical split-leaf philodendron." A blackish-brown thrips with banded brown and white wings that causes extensive silvering of the leaves. Could it be diseased? 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