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Rizzle
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00:0010 Reasons Why Your Zucchini Leaves Are Turning Yellow
00:03Natural Aging of Lower Leaves
00:06Lower, oldest leaves naturally yellow as nutrients relocate to new growth and fruits, so trim them to improve airflow.
00:14Overwatering and Root Rot
00:16Waterlogged soil starves roots of oxygen, inviting rot pathogens, so improve drainage and water deeply but infrequently.
00:25Soil pH imbalance
00:27Alkaline soils lock up nutrients like iron and manganese, so test pH and amend with sulfur to restore availability.
00:36Pest Infestations, like Squash Bugs
00:38Squash bugs and cucumber beetles cause yellow blotches, so remove eggs, handpick pests, and encourage predators with companion plantings.
00:49Iron Chlorosis
00:50High pH or compaction reduces iron uptake, causing intervinyl yellowing,
00:55So apply chelated iron and correct root zone conditions.
01:00Compacted, poorly draining soil
01:02Compacted clay limits aeration and drainage, stressing roots and yellowing leaves.
01:08So loosen soil with compost and coarse amendments.
01:12Nitrogen Deficiency
01:13Low nitrogen yellows older leaves first, so side dress with balanced fertilizer or composted manures to restore vigorous foliage.
01:23Transplant Shock
01:24Transplanting contemporarily yellow leaves as roots adjust, so harden off seedlings and water gently to minimize shock.
01:33Underwatering Stress
01:35Inconsistent moisture or drought yellows and curls edges, so water deeply, then mulch to conserve soil moisture consistently.
01:45Powdery Mildew
01:46Powdery mildew starts white and leads to yellowing, so remove affected leaves, improve airflow, and use milk spray treatments.
01:55Watery Mildew
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