Pest Infestation Severity Score Calculator

ANA›Life Services Authority›National Calculator Authority›Pest Infestation Severity Score Calculator

.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }

Pest Infestation Severity Score Calculator

Calculate a composite Pest Infestation Severity Score (PISS) using population density, affected area, crop damage, pest mobility, and proximity to the economic injury level (EIL). Scores range from 0 (no infestation) to 100 (catastrophic).

Pest Population Density (pests per m²)

Economic Injury Level – EIL (pests per m²)

Infested Area (hectares)

Total Crop Area (hectares)

Observed Crop Damage (%)

Pest Mobility Index (1 = sedentary → 5 = highly mobile)

Calculate Severity Score

Fill in all fields and click Calculate.

function pesCalc() { var resultDiv = document.getElementById("pes-result");

// --- Read inputs --- var density = parseFloat(document.getElementById("pes-density").value); var eil = parseFloat(document.getElementById("pes-eil").value); var area = parseFloat(document.getElementById("pes-area").value); var totalArea = parseFloat(document.getElementById("pes-total-area").value); var damage = parseFloat(document.getElementById("pes-damage").value); var mobility = parseFloat(document.getElementById("pes-mobility").value);

// --- Validation --- if (isNaN(density) || isNaN(eil) || isNaN(area) || isNaN(totalArea) || isNaN(damage) || isNaN(mobility)) { resultDiv.innerHTML = "⚠ Please fill in all fields."; return; } if (density ⚠ Pest density cannot be negative."; return; } if (eil ⚠ Economic Injury Level must be greater than 0."; return; } if (area ⚠ Infested area cannot be negative."; return; } if (totalArea ⚠ Total crop area must be greater than 0."; return; } if (area > totalArea) { resultDiv.innerHTML = "⚠ Infested area cannot exceed total crop area."; return; } if (damage 100) { resultDiv.innerHTML = "⚠ Crop damage must be between 0 and 100%."; return; } if (mobility 5 || !Number.isInteger(mobility)) { resultDiv.innerHTML = "⚠ Mobility index must be a whole number between 1 and 5."; return; }

// --- Sub-scores (each 0–1) ---

// 1. EIL Proximity Score: ratio of density to EIL, capped at 1 // S_eil = min(density / EIL, 1) var S_eil = Math.min(density / eil, 1.0);

// 2. Area Infestation Score: proportion of total area infested // S_area = infested_area / total_area var S_area = area / totalArea;

// 3. Damage Score: observed damage as a fraction // S_damage = damage% / 100 var S_damage = damage / 100.0;

// 4. Mobility Score: normalised mobility index // S_mobility = (mobility - 1) / 4 → 0 when mobility=1, 1 when mobility=5 var S_mobility = (mobility - 1) / 4.0;

// --- Weighted composite score (weights sum to 1) --- // w_eil=0.35, w_area=0.25, w_damage=0.30, w_mobility=0.10 var w_eil = 0.35; var w_area = 0.25; var w_damage = 0.30; var w_mobility = 0.10;

var rawScore = (w_eil * S_eil) + (w_area * S_area) + (w_damage * S_damage) + (w_mobility * S_mobility);

// Scale to 0–100 var PISS = rawScore * 100.0;

// --- Severity classification ---
var severity, color, recommendation;
if (PISS = eil)
? "⚠ Density has reached or exceeded the Economic Injury Level!"
"✔ Density is below the Economic Injury Level.";

// --- Output --- resultDiv.innerHTML = "### Pest Infestation Severity Score (PISS) " + "" + PISS.toFixed(1) + " / 100

" + "Severity Level: " + severity + "

" + "" + "" + "EIL Proximity Sub-score" + (S_eil * 100).toFixed(1) + " / 100 (weight 35%)" + "Area Infestation Sub-score" + (S_area * 100).toFixed(1) + " / 100 (weight 25%)" + "Crop Damage Sub-score" + (S_damage * 100).toFixed(1) + " / 100 (weight 30%)" + "Mobility Sub-score" + (S_mobility * 100).toFixed(1) + " / 100 (weight 10%)" + "" + "" + "" + eilStatus + "

" + "Recommendation: " + recommendation + "

"; }

#### Formula

PISS = 100 × [ 0.35·SEIL + 0.25·Sarea + 0.30·Sdamage + 0.10·Smobility ]

Where each sub-score is normalised to [0, 1]:

Weights (0.35, 0.25, 0.30, 0.10) reflect the relative agronomic importance of each factor and sum to 1.00.

Severity bands: 0–19 Negligible | 20–39 Low | 40–59 Moderate | 60–79 High | 80–100 Catastrophic.

#### Assumptions & References

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References

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