The fruit on my citrus trees turn black and never ripen, the exception is my grape fruit plant.?
Could the problem be a lack of the proper fertilizer, or soil conditions?
1. The problem is most likely a fungus, this is not unusual in citrus trees, but is easily treated if you catch it in time. You may want to remove all the black fruit, any branches or leaves that have this, then spray the tree with a fungicide, repeat after about a week.
This should prevent a recurrence in the coming seasons.
2. When I started gardening as a hobby for the first time,dad told me that fruit and flowering plants should always be kept at place with ample amount of sunlight,so you must make sure that the plant is at right position.Also,prepare natural home-made plant fertilizers with oil cakes,dry leaves,cow dung,waste tea leaves and raw vegetable left-overs.all these can be collected in a pot and left to decompose for few days.My dad says that home made fertilizers are more beneficial to plants as well as soil in comparison to artificial ones.Try for yourself and see,if conditions do not change,better consult a specialist.
3. Take the suggestions of the first 2 answers.
Grape fruits may also get this problem due to lacerating insects damage.
Spray insecticide at weekly interval to control this .
Even Boron deficiency also responsible to this.
4. what you have is a blight,you have to remove all the fruit and leaves that is black and burn them,if you cannot do this
you bag them and tie it tightly you put it in the garbage..
but you have to remove it from around the trees...
spray and wait about three weeks before fertilizing,best thing is soapy water to water and remove the blithe...now you have to make sure you are not over watering,or under watering,and that it is getting the right amount of sunlight
during the day...