What are the common pests and diseases of Lagerstroemia indica in America?

There are few pests and diseases of Lagerstroemia speciosa in the United States, and some are mainly aphids, Lagerstroemia speciosa, giant salamander and sooty blotch induced by pests.

1. For aphids, 800 ~ 1000 times of 1.2% Kuyan EC, 3000 times of 50% pirimicarb, 2500 ~ 3000 times of 2.5% triadimefon or 3000 ~ 4000 times of 6% can be sprayed.

2. For Lagerstroemia indica, if the wax does not form or just begins to form a wax layer within 7 days after the incubation period, spray1500 ~ 2,000 times of 40% quick-killing EC, 2,000 times of 6% imidacloprid soluble concentrated solution and 2,500 times of pyrethroid pesticides on the branches and leaves. The above three chemicals are used alternately and sprayed once every 7 ~ 10 day for 2 ~ 3 times in a row, which can achieve good results. The key to spraying is to seize the opportunity (nymph stage). Once the shell is formed, spraying is difficult to be effective.

3. For the giant salamander, the pouch of the marsupial moth on the tree can be seen after defoliation in winter, which is artificially removed; Trapping and killing adults with frequency vibration insecticidal lamp; Moth larvae are sensitive to trichlorfon, and good results can be achieved by using 90% trichlorfon crystal 1000 to 1500 times. You can also use 3,500 ~ 4,000 times of 2.5% deltamethrin EC, or 1, 000 ~ 1, 500 times of 50% phoxim EC and 1, 500 times of 20% pyrethroid EC to spray evenly and thoughtfully.

4. For sooty blotch, it is mainly caused by the secretion of sucking pests such as aphids and scale insects. The key to control is to spray carbendazim 500 times.

Editor of Jiangxi Lvnong Agricultural Development Co., Ltd.