Gardening

Question

I am sending you photos of 3 different trees. The first is a lemon with black things, the second is an orange tree with orange or brown bugs (I dont know if it is San Carlos), and the third is what my rose’s leaves looks like. Can I treat it with white oil?
Thanks.

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Answer 1

The second image looks like a scale insect infestation. Please see these articles for advice:
https://www.gardeningknowhow.com/edible/fruits/citrus/controlling-citrus-scale.htm
http://oregonstate.edu/dept/nurspest/scale.htm

The first image is probably also a scale insect, black scale, attacking your lemon tree. This article will give you more information:
http://ipm.ucanr.edu/PMG/r107301411.html

The third image might show the beginnings of black spot disease, a common problem with roses:
https://www.gardeningknowhow.com/ornamental/flowers/roses/black-spot-roses.htm
http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/diseases/fungal-spots/black-spot.aspx