Contents
Preamble: …………………………………………………………………………………………………..3
1. Biological Basis ………………………………………………………………………………………..4
1.1 India: Yellow Stem Borer (YSB) …………………………………………………………………4
1.2 China: Attraction Radius ………………………………………………………………………..4
1.3 Africa: Maize & Sorghum Stemborers ………………………………………………………..5
2. Design Principles ………………………………………………………………………………………5
3. Rice Systems……………………………………………………………………………………………6
3.1 – Minimum Hedge Requirement ……………………………………………………………….6
3.2 Plant Numbers …………………………………………………………………………………….6
3.1 Perimeter Hedgerow (Primary Requirement) ……………………………………………….6
3.2 Internal Hedgerows……………………………………………………………………………….6
4. Spacing …………………………………………………………………………………………………..7
4.1 Pest-Management Spacing……………………………………………………………………..7
4.2 Bund-Stability Spacing…………………………………………………………………………..7
4.3 Dual-Purpose Hedges ……………………………………………………………………………7
5. Management ……………………………………………………………………………………………7
5.1 Critical Trim: Pre-Flight Trim…………………………………………………………………….7
5.2 Optional Trim: Post-Harvest Trim ……………………………………………………………..7
5.3 Avoid Frequent Trimming………………………………………………………………………..8
5.4 Additional Notes…………………………………………………………………………………..8
6. Maize & Sorghum Systems…………………………………………………………………………..8
6.1 Objective ……………………………………………………………………………………………8
6.2 Rainfed Systems…………………………………………………………………………………..8
6.3 Larger or Mechanized Fields ……………………………………………………………………9
Disclaimer: These standards are provided as guidance only. TVNI does not assume responsibility for project outcomes.
The performance and results of any vetiver application depend on the decisions, designs, supervision, and workmanship
of those who plan, specify, and implement the work.
The Vetiver Network International
(TVNI)
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Vetiver Grass Technology (VGT) Guides and Design Standards
6.4 Spacing………………………………………………………………………………………………9
6.5 Management ……………………………………………………………………………………….9
7. Summary Table…………………………………………………………………………………………9
8. Key Extension Messages……………………………………………………………………………10
ANNEX 1 — Biological Evidence for Vetiver as a Dead-End Trap Crop………………………10
1.1 Mechanism of Action …………………………………………………………………………..10
1.2 India: Yellow Stem Borer (YSB) ……………………………………………………………….11
1.3 China: Attraction Radius ………………………………………………………………………11
1.4 Africa: Maize & Sorghum Stemborers ………………………………………………………11
1.5 Summary ………………………………………………………………………………………….12
ANNEX 2 — Annual Management Calendar ………………………………………………………12
Critical Principle ……………………………………………………………………………………..12
1. Pre-Flight Trim (Essential)……………………………………………………………………….12
2. Post-Harvest Trim (Optional) …………………………………………………………………..12
3. Avoid Frequent Trimming………………………………………………………………………..12
4. Regional Timing Examples………………………………………………………………………13
ANNEX 4 — Farmer & Extension One-Page Guide……………………………………………….13
ANNEX 5 — Why Vetiver Stemborer Technology Has Not Been Adopted (Global Analysis)
………………………………………………………………………………………………………………14
ANNEX 6 — References………………………………………………………………………………..19
ANNEX 7 — Beneficial Insects Supported by Vetiver Hedgerows ……………………………22
1. Parasitoid Wasps………………………………………………………………………………….22
2. Predatory Insects Supported by Vetiver ……………………………………………………..23
3. Beneficial Insects in Other Crops……………………………………………………………..24
4. Synergy With the Dead-End Trap Crop Mechanism……………………………………….25
5. Summary of Beneficial Insects Associated With Vetiver…………………………………25