astronomy

Raymond G. Grogan

Raymond G. Grogan is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Raymond G. Grogan rather than just read about it. In short: Raymond Gerald Grogan (July 22, 1920 – July 30, 2016) was an American phytopathologist (plant disease researcher). During his career at the University of California, Davis, he primarily researched diseases that affected crops like lettuce, tomatoes, and beans.

Key takeaways

Raymond G. Grogan belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Raymond G. Grogan to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Raymond G. Grogan from memory before moving on to harder problems.

Reference excerpt

Raymond Gerald Grogan (July 22, 1920 – July 30, 2016) was an American phytopathologist (plant disease researcher). During his career at the University of California, Davis, he primarily researched diseases that affected crops like lettuce, tomatoes, and beans. He was the editor of the Annual Review of Phytopathology from 1978–1984.

Early life and education Raymond Gerald Grogan was born on July 22, 1920, in Emma, Georgia, in Dawson County to parents Lula née Parks and Raymond Grady Grogan. Both of his parents were educators, and he eventually attended the school where his father was principal. He had a younger sister, Jane. He attended the University of North Georgia where he earned his bachelor's; he then attended the University of Georgia for his master's degree. Grogan served in the Navy during World War II and was enlisted for three years. After his military service, he enrolled at the University of Wisconsin–Madison and completed a PhD under advisor John Charles Walker, researching diseases of cultivated beans. He demonstrated that some beans were hyper-sensitive to Bean common mosaic virus, causing necrosis. He also discovered that the virus was seed-borne and transmitted from plant to plant via bean pollen. He graduated in 1948.

Career Grogan accepted a position at the University of California, Davis in 1948. In 1960, he was made a full professor. From 1969 to 1974, he was the chair of He remained at UC Davis until his retirement in 1985. Grogan researched various pathogens that affected crops. He determined that the yellowing of lettuce plants, termed "June yellows", was caused by the Lettuce mosaic virus. June yellows could be prevented by using seeds that were resistant to the virus. He also discovered the transmission route of the bacteria Pseudomonas tomato, how to prevent halo blight of beans, and the cause of corky root rot in lettuce. He was the editor of the Annual Review of Phytopathology from 1978–1984. He also served on the editorial boards of the journals Plant Disease, Phytopathology, and Virology.

Awards and honors In 1962, he was awarded the Campbell Soup Company award for outstanding research in vegetable production jointly with Robert N. Campbell. Grogan was elected as a fellow of the American Phytopathological Society in 1969; in 1987 he received its Award of Distinction.

Personal life and death He married Patricia Viola Smith around 1944. They had four daughters; their marriage ended in 1988 with Patricia's death. Grogan died on July 30, 2016, in Santa Cruz, California, just after his 96th birthday.

References

Worked examples

Example 1 — a first encounter with Raymond G. Grogan

Start with the simplest possible case. Write down what Raymond G. Grogan claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Raymond G. Grogan before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Raymond G. Grogan ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Raymond G. Grogan

In research: Raymond G. Grogan appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Raymond G. Grogan in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Raymond G. Grogan is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1920 births, 2016 deaths, American phytopathologists, so understanding it makes those chapters shorter.
In everyday life: Look for Raymond G. Grogan outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Raymond G. Grogan in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Raymond G. Grogan means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Raymond G. Grogan out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Raymond G. Grogan in simple terms?

Why does Raymond G. Grogan matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Raymond G. Grogan?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Raymond G. Grogan.