That wee larva inside the spit is a Spittle Bug, the larva of a froghopper, as it is known, A sharp steam of water can knock the wee bugger off the plant, but just washing away the foam will not necessarily do that. Once the foam is gone you can usually see to wee larva. The other brown, soft, slimy thingys are a bit more difficult but most likely are slugs, or the larva of any one of a number of insects. If a sharp stream of water does not do a good enough job of control (often just knocking these wee buggers off the plant is enough), and Insecticidal Soap is no help perhaps moving up to Neem Oil products or eventually to a pyrethrin based pesticide may be necessary.

I have an 8x4 raised garden. ... I lost my cucumbers and squash and my tomatoes quickly followed ==>> you are severely overplanted ... i have seen squash .. one plant.. cover 10 sq feet ... a tomato.. 3 sq ft if not caged and tended perhaps a pic would change my mind ... in overplanting.. you are affecting many variables .. such as sunlight on plant... sun on soil causing water management issues ... and reducing air movement complicating disease issues ... with so many issue perhaps out of kilter... i am loathe .. to think you have a clinic/bug/disease problem ... we often find with newbs.. that they want to attack the EFFECT ... while not considering the CAUSE ... and i think the CAUSE of your problems is the over planting ... rather than the EFFECT .. which is the resultant problems you are finding .. solving the EFFECT .. does not address the CAUSES a term for you to research.. would be SQUARE FOOT GARDENING ... wherein there is all kind of theory as to how to maximize a given space ... while addressing the issues i mention ... and go figure.. i just checked.. there is a forum named such ... who knows how active it is ... soooo... whether you cant live w/o a squash ... the issue would be.. if you really need to grow it .... though you might be better off.. using the space for more manageable plants.. always consider.. what a harvest costs in season .. and i was just talking to ma.. and she said they are nearly giving away such at the market ... so one would ask themselves.. do i really need to strangle my space.. for a veg that costs near nothing in prime season ... i recall a readers digest joke.. that said.. the only time they lock their cars in newport RI ... was in zucchini seasons.. for fear that strangers will leave bags of such in your car.. if you dont.. lol ... and for me.. that kinda sums up ... the gourd/zuki season ... when in season.. they are giving them away .... why should i bother growing them .... good luck ken

Hi, Is this just occurring on the stems or is it on the leaves too? Is there any wilting? Did you buy the plant or grow it yourself from seed? The plant looks like it's in a pot, so what kind of soil was used? How often is it watered? I know, lots of questions. Let us know what state you live in so that we can narrow down possible diseases and pests. Some parts of the country have more of a problem with some diseases, while other parts of the country have a problem with different diseases. It's the same with pests, so knowing where you live would be helpful.

It`s some kind of leaf hopper most are harmless though some kinds can carry disease but usually not a citrus diease. Your tree does look like it has or had a pretty bad case of spider mites. Get a strong magnafying glass and take a look at the underside of a leaf. Then look up images of spider mites and see if you have em. Horticultural oil works well against them. May need to treat a few times to get them under control.