White tufts in the blackberries. There are no longer colors. What can this be and what is the treatment for this?
I think what you see is a condition called drupelet White Syndrome. It causes some drupelets on the fruit to be colored. They will be smooth though. Here is more info: https://www.gardeningknowhow.com/edible/fruits/raspberry/white-drupelet-syndrome.htm
If what you see is a fluffy mass, send us a picture. It can be a mold or it can be a nuisance, like woolly aphids, and we will only be able to tell from a picture.
After I wash my blackberries, a worm comes out. What can I do? My blackberries are planted by resberries but the raspberry does not seem to have the worm.
Here is a link that has information on the worms that are likely in your Blackberries
https://www.gardeningknowhow.com/edible/fruits/raspberry/raspberry-fruitworm-control.htm
What kind of fertilizer do you use on blackberries?
Use a high phosphorus fertilizer. This will help with berry production.
I want to row my blackberry bushes. What is the best time of the year to do this and how deep do I have to dig to get the right amount of root on the bush? Thank you.
The best time for transplanting blackberries is spring or fall, so now would be the time to get the project done. Select a transplant site that provides full sun, air circulation and is well draining. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/blackberries/growing-blackberry-bushes.htm
Also, it may help to do it in the evening to reduce stress/transplant shock, and be sure to include as much of the roots as possible. If you have not already done so, you may want to prune your blackberry bush as well. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberry-pruning.htm
Can I grow blackberry in a pot?
Yes, you can. They are grown much the same but will require additional watering. This article will help: https://www.gardeningknowhow.com/edible/fruits/berries/berries-growing-container.htm
I know nothing about growing blackberries but have an unknown thornless variety growing in Kona, Hawaii; they were ravaged by Chinese beetles, so I have completely netted an open air quonset frame they're growing in (with canes 1.5cm diameter and 25ft long!). I've had a few delicious berries on last year's miniscule canes (before I started treating the plants well). Now the Chinese beetles are vanquished but am wondering if excluding bugs (AND bees) via the netting, will I have no more berries (i.e. do potentially self-pollinating blackberries still require bees?). Thanks, aloha.
Most cultivators of Blackberries are self-fruitful and do not need pollinators.
Honey Bees are naturally attracted to cane berry fruit and wind also aids in pollination.
I have listed a few links for you with more information.
https://www.gardeningknowhow.com/edible/fruits/blackberries/growing-blackberry-bushes.htm
https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberry-pruning.htm
https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberries-not-fruiting.htm
In late summer when blackberries are gone, how do you know which are spent canes that need to be cut off?
First-year canes, also known as primocanes, appear as stems that arch or trail along the ground. They usually bear large compound leaves with five or seven leaflets; they do not produce any flowers or fruit. Second-year canes grow to become what is known as a floricane. The stem will no longer grow taller, but will begin to produce lateral buds and flowers. Also, these normally have smaller leaves with only three or five leaflets. For information on pruning, this article should help: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberry-pruning.htm