Garden Pests and Diseases: Friend or Foe #2, 1 by Night_Bloom

Night_Bloom wrote:
last picture - and this is also for margu - I have a feeling that your "pretty white butterfly" might be a cabbage butterfly. Keep an eye out, because the caterpillars of these guys will eat your cabbage and related garden veggies if you don't have predatory bugs and wasps or yellow jackets to eat them for you. They can also be taken out by diseases which will make the caterpillars look black and crumpled.

Here's a picture of the cabbage butterfly (family Pieridae - the sulfur butterflies, Pieris rapae).