Ryan Horton - Entomology worksheet Visible Proof.pdf - The ... - Free Printable

Let’s go step by step through the worksheet.

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Question 1:
> Read each of information on species below (Fig. A) for Cydia latiferreana and answer the questions that follow.

We’re told to use Fig. A — but since we don’t have the figure, we’ll assume standard known facts about *Cydia latiferreana* (the filbertworm moth), which is a real pest of hazelnuts/filberts. But wait — looking at Question 2, it gives us a table with data for “Table 1: Life cycle of the Green Stink Bug” — so maybe this whole worksheet is actually about the Green Stink Bug, not *Cydia latiferreana*. That might be a typo or mislabeling in the header.

Looking ahead:

- Q2 asks to calculate developmental time using Table 1 (which is labeled “Life cycle of the Green Stink Bug”)
- Q3 says “Using the above Table 1…” → again referring to Green Stink Bug
- Q4–Q7 all refer to “Green Stink Bug”

So despite the header mentioning *Cydia latiferreana*, the actual data and questions are about the Green Stink Bug. We’ll proceed with that assumption — likely an error in the worksheet title.

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Question 2:
> Calculate the developmental timing of the green stink bug required for each stage of the Green Stink Bug life cycle. Use Table 1.

Table 1 shows:

| Stage | Min Days | Max Days | Avg Days |
|-------------------|----------|----------|----------|
| Egg | 5 | 8 | 6.5 |
| Nymph – Instar 1 | 3 | 5 | 4 |
| Nymph – Instar 2 | 3 | 5 | 4 |
| Nymph – Instar 3 | 3 | 5 | 4 |
| Nymph – Instar 4 | 3 | 5 | 4 |
| Nymph – Instar 5 | 5 | 9 | 7 |
| Adult | ? | ? | ? |

Wait — the table doesn’t give adult duration? But the question says “each stage”. Let’s check if “Adult” row has numbers — in the image description, it seems like the Adult row may be blank or missing values. But in many such worksheets, they expect you to sum only the stages given.

Actually, re-reading: “Calculate the developmental timing... for each stage” — meaning, probably just report the avg days per stage as given? Or maybe total from egg to adult?

But then Q3 says: “Determine how long it takes the green stink bug to develop from egg to adult.” So Q2 might just be asking to list the average days per stage — which are already given in the “Avg Days” column.

Perhaps Q2 is just copying the “Avg Days” for each stage? That would make sense.

But let’s look at Q3 next.

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Question 3:
> Determine how long it takes the green stink bug to develop from egg to adult.

This means: add up the average days for all stages from Egg through Instar 5 (since adult is the final stage, development ends when it becomes adult).

From Table 1:

- Egg: 6.5
- Instar 1: 4
- Instar 2: 4
- Instar 3: 4
- Instar 4: 4
- Instar 5: 7

Add them:

6.5 + 4 = 10.5
10.5 + 4 = 14.5
14.5 + 4 = 18.5
18.5 + 4 = 22.5
22.5 + 7 = 29.5 days

So from egg to adult: 29.5 days

Note: Some might argue whether to include adult stage — but “develop from egg to adult” usually means until it reaches adulthood, not including how long it lives as adult. So we stop at end of Instar 5.

✔ Confirmed: 29.5 days

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Question 4:
> How many more days does it take for the GSB to lay its eggs than to hatch?

“GSB” = Green Stink Bug

“Lay its eggs” — that’s the adult female laying eggs. But the time to “lay eggs” isn’t directly given. Wait — perhaps it’s comparing:

- Time from egg being laid to hatching → that’s the Egg stage duration = 6.5 days (avg)
- Time from adult emerging to laying first eggs? Not given.

Wait — reread: “How many more days does it take for the GSB to lay its eggs than to hatch?”

That phrasing is odd. Maybe it means:

“How many more days does it take for the GSB [to complete development] to lay its eggs [i.e., become an adult capable of laying eggs] than [for the egg] to hatch?”

In other words:

- Time from egg laid to hatching: 6.5 days
- Time from egg laid to adult (ready to lay eggs): 29.5 days (from Q3)

Then difference: 29.5 - 6.5 = 23 days

That makes sense.

Alternative interpretation: “time to lay eggs” could mean the pre-oviposition period (time after becoming adult before laying eggs) — but that’s not in the table. Since no data is given for that, the intended answer is likely 29.5 - 6.5 = 23 days.

✔ Answer: 23 days

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Question 5:
> If you applied an insecticide to kill the nymphs, what percent of the population would be killed if you treated during instar 3? Assume equal number of individuals in each instar.

There are 5 instars (Instar 1 to 5). If equal number in each, then treating during Instar 3 kills only those in Instar 3.

Total instars = 5

Percent killed = (1 / 5) × 100% = 20%

But wait — does “treated during instar 3” mean only killing Instar 3, or also affecting others? The question says “kill the nymphs” and “treated during instar 3” — implying application targets that stage. And since it says “assume equal number in each instar”, we treat each instar as 20% of nymph population.

Nymphs include Instars 1–5. Adults and eggs are separate.

The question says “kill the nymphs” — so we’re only considering nymph stages. There are 5 nymph instars. Treating during Instar 3 kills only Instar 3 nymphs → 1 out of 5 → 20%.

✔ Answer: 20%

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Question 6:
> If there are currently 10 Green Stink Bugs flying around your backyard, how long will it take for them to produce offspring? Explain.

Current bugs are adults (flying). To produce offspring, they need to mate and lay eggs.

But the table doesn’t give time from adult emergence to egg-laying. However, in many insects, adults can lay eggs soon after maturing — sometimes within days.

But since no data is given for pre-oviposition period, and the only durations given are for immature stages, perhaps we assume that once they are adults, they can lay eggs immediately? But that’s biologically unlikely.

Wait — look back at Q4: we calculated that it takes 29.5 days from egg to adult. But for current adults, they are already developed. So the time to produce offspring depends on:

- Mating time (not given)
- Pre-oviposition period (not given)

Since no data is provided for adult reproductive timeline, and the worksheet is based on Table 1 (which only covers development from egg to adult), perhaps the expected answer is that we cannot determine from given info — but that seems too advanced.

Alternatively, maybe the question implies: how long until their *offspring* emerge? But that would require knowing when they lay eggs, plus egg development time.

Another angle: perhaps “produce offspring” means until the next generation hatches? But again, without knowing when adults lay eggs, we can’t say.

Wait — let’s read carefully: “how long will it take for them to produce offspring?”

If we assume that adult females can lay eggs immediately (or within negligible time), then the time to “produce offspring” could mean until the eggs hatch — which is 6.5 days (egg stage).

But that ignores mating and oviposition delay.

Given the context of the worksheet and available data, the most reasonable assumption is:

→ Adults are ready to lay eggs now (or very soon), and the limiting factor is egg development time.

So: time to produce offspring = time for eggs to hatch = 6.5 days

But the question says “explain”, so we should note the assumption.

However, looking at typical textbook problems, they often expect: since adults are present, and egg stage is 6.5 days, then offspring (hatched nymphs) appear in 6.5 days.

✔ Answer: 6.5 days (assuming adults lay eggs immediately)

Explanation: The adult bugs can lay eggs right away. The eggs take an average of 6.5 days to hatch into nymphs, which are the offspring.

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Question 7:
> What is the minimum amount of time it would take for a single female to produce a new generation of Green Stink Bugs? Include a diagram showing the life cycle.

“New generation” means from one adult female laying eggs to her offspring becoming adults (capable of reproducing).

So: time from egg laid by parent → to offspring reaching adulthood.

That’s exactly what we calculated in Q3: 29.5 days (average)

But the question asks for minimum amount of time.

So we must use the minimum days for each stage from Table 1:

- Egg min: 5
- Instar 1 min: 3
- Instar 2 min: 3
- Instar 3 min: 3
- Instar 4 min: 3
- Instar 5 min: 5

Sum: 5 + 3 + 3 + 3 + 3 + 5 =

5+3=8; 8+3=11; 11+3=14; 14+3=17; 17+5= 22 days

So minimum time from egg to adult: 22 days

Now, “include a diagram” — since we’re text-based, we can describe it:

Diagram description:

Start: Adult Female lays Egg → Egg (min 5 days) → Hatches into Nymph Instar 1 (min 3 days) → Instar 2 (min 3) → Instar 3 (min 3) → Instar 4 (min 3) → Instar 5 (min 5) → Becomes Adult (new generation)

Total minimum: 22 days

Note: We don’t add adult lifespan because “produce a new generation” means until the offspring are adults themselves.

✔ Answer: 22 days

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Question 8:
> Based off of your answers above explain why this insect may be hard to control in orchards? Give two reasons.

From previous answers:

- Development from egg to adult takes ~29.5 days on average, min 22 days → relatively fast reproduction
- Multiple nymphal stages (5 instars) → if you miss one stage, survivors continue
- In Q5, treating only one instar kills only 20% of nymphs → hard to eliminate entire population with single treatment
- Adults fly (Q6 mentions “flying around”) → mobile, hard to target
- Short generation time → multiple generations per season possible

Two good reasons:

1. They have multiple nymph stages (5 instars), so spraying at one time may only kill part of the population (e.g., only 20% if targeting one instar).
2. They develop quickly (as little as 22 days from egg to adult), allowing several generations in one growing season, making populations rebound fast.

Also, adults are mobile (fly), so they can escape treatments or reinfect areas.

✔ Two reasons:
- Fast development allows multiple generations per year.
- Multiple nymph stages make it hard to kill all individuals with a single pesticide application.

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Now, compiling final answers clearly.

Note: For Q2, since it says “calculate the developmental timing... for each stage”, and the table already provides “Avg Days”, perhaps Q2 just wants us to list them. But since no calculation is needed beyond reading the table, and Q3 uses those to sum, I think Q2 is just reporting the avg days per stage as given.

But to be precise, let’s write:

For Q2: The developmental timing (average days) for each stage is as listed in Table 1 under “Avg Days”:
- Egg: 6.5 days
- Nymph Instar 1: 4 days
- Nymph Instar 2: 4 days
- Nymph Instar 3: 4 days
- Nymph Instar 4: 4 days
- Nymph Instar 5: 7 days
- Adult: not specified (development ends at adult)

But since the question says “calculate”, and no math is needed, perhaps it’s just to extract the values.

I’ll provide the sums where needed.

Final Answers:

──────────────────────────────────────

Final Answer:
Q2: Developmental timing (avg days per stage): Egg=6.5, Instar1=4, Instar2=4, Instar3=4, Instar4=4, Instar5=7
Q3: 29.5 days
Q4: 23 days
Q5: 20%
Q6: 6.5 days (assuming adults lay eggs immediately; offspring hatch in 6.5 days)
Q7: 22 days (minimum time from egg to adult using min days per stage)
Q8: Two reasons: (1) Fast development (min 22 days) allows multiple generations per season; (2) Five nymph stages mean single pesticide applications kill only a fraction (e.g., 20%) of the population.