2019 Host Damage Criteria Daniel Mackesy daniel z
- Slides: 8
2019 Host Damage Criteria Daniel Mackesy daniel. z. mackesy@aphis. usda. gov Heather Moylett heather. moylett@aphis. usda. gov
Topics n n n How much evidence of host damage is necessary to justify a survey for a pest? When should a pest be included on a CAPS survey list (or not)? Should surveys occur in minor or experimental hosts?
Pest List Issues § Many pests were placed on the CAPS list a long time ago, and not all hosts are fully vetted. § Some pests are on host lists without direct evidence of the pest damaging the host, and surveys are common. § Surveys occur in minor or experimental hosts.
Host Issues § Problem: Hosts are sometimes listed as “major” hosts with indirect evidence of damage. Pest Autographa gamma Common Name Silver Y moth Eutetranychus Citrus brown mite orientalis Pest Lists corn, cotton grape, small grains solanaceous soybean Indirect major hosts cotton grape soybean wheat (small grains) OPEP status Pending cotton, soybean cotton soybean Pending Spodoptera littoralis Egyptian cottonworm corn, cotton grape, small grains wheat (small grains) solanaceous soybean Complete (Mod impact) Spodoptera litura Cotton cutworm Complete (High/Mod impact) Thaumatotibia False codling moth leucotreta corn, cotton corn grape, solanaceous grape corn, cotton grape, oak solanaceous stone fruit grape oak Complete (High impact)
Host Issues § Problem: Surveys are common in indirect “major” hosts Pest Autographa gamma Common Name Silver Y moth Eutetranychus Citrus brown orientalis mite Indirect major hosts cotton grape soybean wheat (small grains) cotton soybean Spodoptera littoralis Egyptian cottonworm Spodoptera litura Cotton cutworm corn grape Thaumatotibia False codling leucotreta moth wheat (small grains) grape oak Surveys in indirect hosts since 2015 (CAPS or FB) Cotton: 5 Grape: 11 Soybean: 23 Wheat: 11 Total: 52 Cotton: 1 Soybean: 5 Total: 6 Wheat: 17 Grape: 19 Total: 36 Corn: 29 Grape: 11 Total: 40 Grape: 13 Oak: 13 Total: 26 Grand Total: 160
Host Issues § Possible problem: Pests are on survey lists with minor or experimental hosts. Pest Common Name Alectra vogelii Yellow witchweed Chlorophorus strobilicola Pest Lists Proposed changes soybean Remove from Soybean list? Slender-banded EWBB/BB pinecone longhorn beetle Heteronychus Black maize arator beetle corn grape Remove from CAPS list? Remove from grape? Notes OPEP status Soybean is a secondary host. Can request a weed risk assessment Minimal direct host Pending evidence for pine, no other confirmed hosts. No trap/lure. Grape is a minor Pending host. Minimal direct evidence. No trap/lure Lymantria mathura Rosy moth Asian defoliator oak pine Remove from pine, Pine and oak are Complete oak? experimental hosts (Moderate)
Questions for NCC § How should we handle pests with indirect “major” hosts? Are surveys in these hosts justified? § When, if ever, should we survey in minor or experimental hosts? Is that worth the allocation of resources?
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