Help: Papaya and mango saplings

[8keep]

Hi,

I have some mango and papaya that I've sprouted from seeds that are not doing too well. The mango leaves are turning brown, and since this picture (a week ago) some leaves have fallen off. I don't know what to do. Is this spreadable to other trees or is this a nutrient thing? Should I kill the plants?
I also don't know whats wrong with the papaya seedlings. The leaves are all yellow and they are not growing well. Since the picture, I've lost a few of them. I haven't put any kind of fertilizer because I don't want to kill them, they are very young.
Any suggestions?

[Tropicdude]

Lots of stuff can be happening here,   too much water,  or water that has chlorine in it.   for example,  these are little seedlings, so you do not really want them in the harsh sunlight,  yet,  partial sunlight,  until they get bigger.   

[8keep]

I water the papayas with a watering can that has had city water sit in a watering can for at least 24 hours, to let the chlorine evaporate. Is that enough or should I be doing something more? The mangos I water straight from the hose, I will change that, I will set up a rain barrel soon. It has been raining here consistently lately so I haven't been watering for a while.

[bsbullie]

What soil are they in?  Have you addrd any fertilizer?  Where are the plants located and light source?

[8keep]

They are in miracle grow soil from lowes mixed with some local soil. Here are some updates:










In addition: I have a new problem. These weird bugs started appearing on the end tips of my barbados cherry that I bought from Truly Tropical a month ago. I have no idea what they are and they are spreading fast. I tried spraying neem oil on them and it didn't help. They keep spreading.











If anyone could help me identify my problems, that would be great!

Thanks,
Davis

[simon_grow]

I can't zoom in on the pics because postimage is acting up but from what I can see, they look like aphids. You can hose them off or use insecticidal soap.

Your seedlings look like they need a good fertilizer with a balanced micronutrient package.

Simon

[greenman62]

being too wet really bothers papaya.
they need to dry out every few days.

the mango could be sunburn, or nutes.
mango seeds are large, so i see people grow them
and see the big beautiful leaves, then after the 3rd set
the seedling starts to fail because the seed ran out of energy.
personally, i would mix a little fine compost in and water it with fish emulsion.
papaya would like that as well.

the acerola looks like aphids.
too much nitrogen can produce lots of weak new growth
that are attacked easily by insects.

i plant milkweed which brings aphids in by the hundreds
and also brings in the predators
and the aphids seem to like the milkweed so much
they leave everything else alone.