Who are weevils? Detailed answer

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Who are weevils? Detailed answer

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Who are weevils?

When the weevil was first discovered in the United States, cotton growers refused to believe that this little brown bug could cause serious damage. This discovery took place in south Texas in 1892. About thirty years later, it was estimated that the annual loss of cotton from the weevil was approximately 6 bales!

The weevil is native to Central America. It spread north through Mexico and crossed the Texas border at Brownsville. Like many insects, it has an excellent sense of smell. Experiments have shown that weevils can smell a cotton field miles away!

As an adult, the beetle is about a quarter of an inch long. Its jaws are at the end of the stigma and are well adapted for making holes in cotton bolls. In winter, the bug sleeps under dry grass or leaves or in some cracks in the ground. In the spring, when cotton bolls begin to form, it begins its destructive work. The female weevil penetrates inside the cotton boll and lays eggs there. After three or four days, larvae hatch from the eggs, for which the contents of the box serve as food.

Young cotton buds are a favorite feeding place for the weevil; but if there are no more buds, then the beetles attack the bolls or the remains of the bolls filled with fibrous pulp. The larvae remain inside the boxes until the moment when they turn into beetles.

A weevil can have four or five generations of offspring in a season, so it's not hard to see how much damage they can cause. Bolls affected by the weevil fall off before ripening, and their fiber can no longer be used.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why do all planets look different?

The reason why the planets seem different to us is that each of them is made up of different substances. Despite the fact that they all revolve around the Sun and are part of the same solar system, their composition varies. Very little is known about what the planets are made of, and this is one of the questions that man hopes to answer with the help of space studies that have been carried out and are planned in the future.

Let's take a look at each of the planets and see what we know about their composition.

Mercury is a small mountain world. It has several dark areas and many craters, but there is no atmosphere or water in the notes. Venus is a white orb with hazy spots. It is almost completely covered with a layer of white clouds, which do not consist of water vapor, but of hydrochloric acid vapor. Beneath these clouds is the atmosphere of Venus, mostly composed of carbon dioxide, which is unbreathable. It absorbs solar heat like a blanket, so the temperature on the planet's surface reaches about 500 ° C, and because of this, there is no liquid water on Venus. Mars is called the red planet because of the color of its deserts. It is half the size of Earth and has a very thin layer of carbon dioxide atmosphere in which clouds form. No definite signs of life have been found on Mars. Maybe it's because it's very cold there.

Jupiter appears before us as a yellowish ball with colored bands of clouds swirling around it, and a giant red spot clearly visible against the clouds. Jupiter is a giant liquid ball of mostly hydrogen and helium that gets denser towards the center of the planet. Saturn is mostly liquid hydrogen and has several bright rings around it. They are made up of countless particles that move in their orbits around the planet like small moons.

There are also rings around Uranus, but they are much darker than the rings of Saturn. Neptune is a dim greenish planet, while Pluto is the smallest planet in the solar system. It has an elliptical orbit and therefore sometimes comes closer to the Sun than Neptune. Space exploration through satellites and robotic stations is helping scientists learn more about every element of our solar system.

Test your knowledge! Did you know...

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Random news from the Archive

Google to supply 27 Chromebooks to US schools 03.02.2012

Education is a highly lucrative social life for technology companies. No wonder Intel is actively developing netbooks for use in schools, Apple is also promoting a number of educational initiatives (which is worth at least the latest announcement of digital textbooks within the iBook 2). Not surprisingly, Google also wants to be present in this promising market. Ryan Sheth, Google's head of Chromebook business and education, told an education technology conference in Florida that the search giant will ship more than 27 browser-based laptops to three U.S. school districts (Iowa, Illinois, and South Carolina). Chrome OS as part of a special program.

Including these three districts, according to Mr. Sheth, hundreds of schools in 41 US states now have at least one classroom equipped with Chromebooks. Bringing Google devices into schools is also important to the company because today's students are tomorrow's electronics buyers. But Google should also pay attention to what one Chromebook proponent has to say about her kids' addictions. "A lot of schools use operating systems that are 5-10 years old because of the cost and labor involved in upgrading to the latest standards," Mr. Sheth says. "Chromebooks, on the other hand, automatically update and get better over time."

"Students love tablets. I'm not going to hide this fact from you. They are ready [for them] to bow to you," says Diane Gilbert, a middle school English teacher at Blythwood, South Carolina, who uses tablets in her teaching practice. . However, she notes that Chromebooks are better suited for the educational process due to more convenient printing of texts and publishing work in a teacher-friendly way. Diane Gilbert, a teacher in South Carolina, holds a Chromebook in her hand and says students love the variety in their corpus designs.

Google's first generation of cloud laptops were widely criticized for poor performance, but Samsung showed off a faster Chromebook model at CES 2012. Ryan Sheth also notes that Chromebooks are very good for schools that need light administration and for students who value 8-second downloads and up to 8,5 hours of battery life.

Of course, several thousand devices are a drop in the ocean, if we talk about the global school and educational market. But Google has to start somewhere, and school representatives were happy to tout the benefits of Chromebooks during the roundtable discussion.

"This is the kind of device that students need to learn," said Brian Weinert, technology coordinator for Leiden School District in Illinois. and at home." Chromebooks will replace netbooks for the following reasons, he says: "We're looking for a device that can be discreet. We want teachers to focus on guidance rather than tech support, waiting for laptops to boot up and checking batteries."

Richland Second School District in South Carolina will use 19 Chromebooks as part of a three-year program to provide these devices to students in grades three through 12, Donna Teuber, the district's technology adoption coordinator, said.
Iowa's Council Bluffs Community School District plans to use 2800 devices in high school and 1500 in middle school. The information systems manager for the district announced this at the conference, adding: "Next fall, we hope to give each student one of these devices."

Chromebooks are closely related to Google apps and can also run apps downloaded from the Chrome Web Store or simply downloaded as web pages. In fact, almost the entire environment is limited to the Chrome browser, and all settings and applications are stored in the cloud, making administration a fairly easy task.

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