How to choose a good oil gourd

There are many kinds of water hyacinths. Common varieties are "black gourd" with dark body color and "red oil gourd" with brown body color. There is a kind called "Pipa Wing", which has a blunt long tail and can cover the tail beard 1/3, with a loud voice. There is a kind of wings that are very thin and transparent, called "glass wings" or "thin wings", and the singing voice is low and floating. Known as a kind of "flying wing", the back wing is long and exposed outside the front wing, which generally calls less, but it is more precious because of its small number. One is called "long wings", with long wings but not wide at both ends, and the sound is generally alto. For the above kinds of oil gourd, Dendrolimus punctatus lovers have compiled a jingle: flying wings are expensive, glass is brittle, pipa is brittle, and long wings are bright. This is the expert's evaluation of them. The head with a high forehead is called "Shouxingtou"; Round head and wide head are called "garlic"; The round head is called "pearl head" Among the three, "Shouxingtou" is the most expensive. There are roughly two syllables in the singing of the oil gourd: one kind of singing, such as "Ju-, You, You, You", is a veritable oil gourd and a good product, just like the sound of oil pouring out of the gourd; Another way of singing, such as "Ji, Ji, Ji", is inferior. The selection of water hyacinth should mainly start from four aspects: body, color, wings and sound. "Body" refers to body shape and physique. The oil gourd should be big, with a big head and a wide jaw, so that it is strong, long-lived and loud; Small bodies are mostly congenital deficiency, dysplasia, or injury, short life span and weak singing. "Color" is the body color. Most people like oil gourd, which is black and shiny, and thinks that the color is pure and beautiful, with high ornamental value and pleasant to listen to. In fact, this is not absolute. As long as the color is bright, no matter golden yellow, red, purple or brown, it has high quality and unique ornamental value. "Wings" refers to the length of wings. Half is that the longer the wings, the louder the song. For example, if the front wing covers the tail end, it is a long-winged species that is one in a hundred, and the song is bound to be loud. Coupled with the blunt tip of the wing, the song is bound to be loud. "Sound" refers to the sound of singing. You should choose a loud and soft voice with a long vibrato, such as "Ju-, You, You, You", whose "you" sound can be repeated 5-6 times, and the elderly can reach 9 times. This kind of insect is called "nine-turn oil pan" by the appreciator. In addition, if you want to listen to singing, you should choose the oil gourd with a small head, because the one with a small head is more willing to sing than the one with a big head.