1,300 lemon trees (6 yr, 10 ft) on field boundaries in Shujabad, Pakistan. Good crop at 3 yr; last 3 yr: leaves oily/blackish, sprayed pesticides, flowers appeared but fell, only 2–3 lemons/tree. Also 2,500 mango trees. Sunny, no shade.
Oily black leaves = sooty mold on honeydew from sucking insects (scale, aphids, whiteflies). Pesticides may not target correctly.
Expert insight provided by Kathy.
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