Two-spotted spider mites, also known as two-spotted spider mites or white spiders, mainly damage strawberries and damage apples, pears, peaches, plums, apricots, cherries and other fruits, as well as more than 200 plants such as flowers and vegetables. [harmful symptoms] The sap of the strawberry leaves is spurted by calving and nymph, and the succulent leaves begin to show chlorotic mottled only in the vicinity of the main vein, and gradually expand into pieces in the future, and the yellow leaves lose their physiological functions. ã€Morphological characteristics】 The female is oval-shaped, about 0.5 mm long, grayish white, with a brown plaque on each side of the body, and the overwintering female becomes orange-yellow, and the brown spots disappear. The male scorpion is smaller in shape. The egg is spherical and has a diameter of 0.1 mm. It is initially white and gradually becomes yellowish and shiny. Two dark red eye spots appear before hatching. Cub: yellowish white hemisphere, red eyes, 3 pairs of feet. If 螨: oval, yellow-green, there are significant brown spots on the back of the body, there are 4 pairs of feet. [Pathogenesis] More than 10 generations of seizures in 1 year, the wintering of the cockroaches in the gaps of the old skin under the bark, the roots of weeds, the leaves and the gaps in the soil, the temperature of the greenhouse began to damage, and the growth and reproduction of good and bad cockroaches above 20 °C, 27 ° C The development speed is accelerated, and it can be propagated for 1 generation in 10 days. The adult mites lay eggs on the back of the leaves. The larvae hatch in 3 to 5 days, and the pupa has the habit of spitting silk nets. The drought and high temperature ventilation are bad. Before and after fruit harvesting, it is the main damage period of spider mites. Often due to negligence, the fruit is harvested after the serious damage period of the leafhopper. [Control method] Before the warming of the greenhouse, the litter and weeds will be removed and burned to eliminate the insect source. Spray 0.5% sea chlorhexidine 3000 times solution before flowering; after harvesting, choose 1.8% Qiqisu emulsifiable concentrate 4000 times solution; or 5% 螨 螨 spirit emulsifiable concentrate 2500 times solution; or 10% Liuyangmycin emulsifiable concentrate 1000 times solution; Or 20% Daphne Ling EC 2000 times solution 5% card gram emulsifiable concentrate 1000 times solution, 20% dying net suspension 2000-3000 times solution, 5% Nissole emulsifiable concentrate or 25% leuco WP and 73 % gram emulsifiable concentrate 2000 times solution. The medicinal agent should be sprayed on the back of the blade as much as possible to get a better effect. The drug was discontinued 20 days before fruit harvest. More pesticide knowledge , please pay attention to China Pesticide Network
A flange can also be a plate or ring to form
a rim at the end of a pipe when fastened to the pipe. A blind flange is a plate
for covering or closing the end of a pipe. A flange joint is a connection of
pipes, where the connecting pieces have flanges by which the parts are bolted
together.
Although the word flange generally refers to
the actual raised rim or lip of a fitting, many flanged plumbing fittings are
themselves known as 'flanges':
There are many
different flange standards to be found worldwide. To allow easy functionality
and interchangeability, these are designed to have standardised dimensions.
Common world standards include ASA/ASME (USA), PN/DIN (European), BS10
(British/Australian), and JIS/KS (Japanese/Korean). In the USA, ANSI stopped
publishing B16.5 in 1996, and the standard is ASME B16.5
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