I Plant Quarantine 1.Pest's methods of spreading Natural spread:flying,crawling,diffusing with wind and flowing water. Spread by means of human activity:moving seeds, seedlings,plant products or packs,tools. Apple wool aphid Vegetable leafminer Grape phylloxereⅠ. Plant Quarantine 1. Pest’s methods of spreading „ Natural spread: flying, crawling, diffusing with wind and flowing water. „ Spread by means of human activity: moving seeds, seedlings, plant products or packs, tools. Apple wool aphid Apple wool aphid Vegetable Vegetable leafminer leafminer Grape phylloxere phylloxere