How to prevent and control common pests and diseases of clivia

There are three pests that cause the greatest harm to clivia: first, slugs; second, snails; third, cottony cushion scale, commonly known as cotton insects.

Slugs are omnivorous mollusks, also called shell-less worms, slugs, or snot worms. They specifically gnaw on seedlings and newly grown tender leaves, forming irregular notches and holes. They also damage the newly emerged flower stalks and flower stems. They cause new leaves to grow crooked starting from the notched areas they gnaw, and cause newly emerged flower stalks to split at the gnawed stalk areas until they break off. This causes extremely serious harm to clivia. At the same time, their excrement and the mucus left by their crawling contaminate the plant, allowing pathogens to invade, causing leaves to rot and easily leading to soft rot. Snails are also omnivorous mollusks. Snails have shells, and they also like to eat the tender tissues of plants, such as tender leaves, new buds, root tips, and flower stamens. They cause irregular wounds or cavities. The greatest harm from snails is that after they eat the newly emerged central tender leaves, the flower core has no growth point, so the entire plant, especially mature orchids, cannot bloom or send up flower stalks, and cannot grow new leaves, making the entire plant worthless. Scale insects are also one of the most common pests of clivia. In particular, cottony cushion scale causes the greatest harm to clivia. It appears white and powdery, often attached to leaves, fruits, and stems, sucking their sap and secreting mucus, turning black, hindering growth, destroying chlorophyll, producing slightly sunken pale yellow spots, and in severe cases causing leaf drop and the whole plant to wither.

The methods for preventing and controlling slugs and snails are:

First, taking advantage of their habit of liking moisture and hiding by day and coming out at night, use manual capture. Place cabbage leaves near where they appear and move about, sprinkle a little wheat bran or cornmeal on top, and concentrate on capturing and killing them before dawn, or mix arsenic or trichlorfon and other baits into the wheat bran or cornmeal to kill them.

Second, use lime as a barrier. Sprinkle lime around their activity area, and they will die once they touch it.

Third, apply 8% metaldehyde or molluscicide or 10% metaldehyde formulation at 1.5 grams per square meter. Using the above methods can achieve the goal of completely eliminating them.

Methods for preventing and controlling scale insects:

First, when there are few, they can be removed with a rag or brush.

Second, when an infestation has just occurred, use a cotton ball dipped in alcohol to touch and kill the insects.

Third, use emulsified dimethoate diluted with water at a 1:800 ratio and spray it onto the affected areas to kill the insects.