Degree Day Worksheet Name Page 1 There Are Five Handouts For Today S Lab The First Are General Introductions To The Ide 1 (57.45 KiB) Viewed 41 times
Degree Day Worksheet Name Page 1 There Are Five Handouts For Today S Lab The First Are General Introductions To The Ide 2 (37.15 KiB) Viewed 41 times
Degree-Day worksheet Name Page 1 There are five handouts for today's lab. The first are general introductions to the ideas of physiological time, and Degree Days. These concepts are also described in section 6.10.1 in your textbook. After reviewing the introductions in The UCIPM page and the NCSU Entomology 425 page, and the text if you have it, complete the review questions on the Entomology 425 page. As you can see from the UCIPM page and the book, there can be somewhat complex functions to describe the area under the daily temperature curve, but we will use the simplest, the triangle method, which assumes linear increase and decrease in temperature, so you can just use the average number of degrees above the base physiological temperature to estimate the degree days added for each day. This is described below from the UC Boulder Gordon Alexander Resurvey project. Growing degree days (GDD) is a term used to define number the average of temperature degrees above TBASE that occur over a given 24 hour period. That is, 2 GDDs simply reflects a day in which the average Growing degree dage & development 19 Developmental rate (1) GDD= 00 Temperature/C Figure. The band upper threshold temperatures for the grasshoppers inthsstudy are 12 C and 38 °C, pectively Growth and development egin after temperatursexced 12 "Cand incremer 38 C daily temperature exceeded the minimum threshold (TBASE) by 2 degrees. In turn, The number of GDD recorded during a day is an estimate of the energy that is available to a given organism for growth and development. On days with a low number of GDDs little development may occur, while warmer days (associated with a greater number of GDDs) may provide more heat energy and thus increase the rate of development. The number of GDD is calculated by subtracting the TBASE from the average daily temperature. Tmax + Tmin -TBASE 2 Where Tmax is the hottest part of the day and Tmin is the coldest part of the day. For
OK, after doing the questionnaire, answer the following two questions. 1. Let's say we collected eggs and adults but found no larvae at a farm on Friday June 5". The pesticide the grower wants to use works best on larvae younger than 3 instar. Using the almanac and the degree day table from the 'Colorado Potato Beetle' handout, what day would you recommend spraying to hit the largest number of larvae before they age out of vulnerability? Explain your thinking and show work. 2. Using the same data, What day do you expect to see the first summer-hatched adults emerge?
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