The longan originated in southern China.

Longan (scientific name: Dimocarpus longan? Lour.) is a genus of longan in the family Sapindaceae. Evergreen tree, usually more than 10 meters high; branchlets stout, puberulent, scattered pale white lenticels. Leaves with stipe 15-30 cm or longer; leaflets 4-5 pairs, thinly leathery, oblong-elliptic to oblong-lanceolate, often asymmetric on both sides.

Leaflet petioles usually not more than 5 mm long. Inflorescences large, much branched; pedicels short; sepals subleathery, triangular-ovate; petals creamy white, lanceolate, subequal to sepals, puberulent only outside; filaments hispidulous. Fruit subglobose, usually yellow-brown or sometimes gray-yellow, outside slightly rough, or rarely with slightly convex tubercles; seeds tea-brown, shiny, all covered with fleshy aril. Fl. spring-summer, fr. summer.

Longan pests

There are about 110 species of pests of longan. There are mainly lygus bugs, which harm the shoots, flower spikes, shoot tips and young fruits, often leading to large numbers of fallen flowers, fallen fruits or grain harvest. Preventive measures: in March-May with trichlorfon 800-1000 times liquid or 20% permethrin 2000-8000 times liquid spray 2-3 times; biological control, the use of flat-bellied small bees in the early stage of the Lybug egg-laying bees, every 10 days to put 1, put 3 times in a row.

In addition, the white moth waxhopper, longan裳卷蛾, longan corneal woodlouse, lines fine moth is also a pest of longan, will cause some losses, to strengthen management, protection of natural enemies. Preventive measures: combined with pruning; thinning flowers and fruits, cut off the insect-bearing branches and leaves burned; with dichlorvos emulsion, 40% Rogaine emulsion, 50% phosphamidon emulsion, pyrethroids, insecticides, insecticides, insecticides double, insecticides, etc. Spray treatment can be.