Sorpresa en la cosecha

Most likely butterfly/moth eggs. Sails do not lat eggs on plants, more likely to find them hidden in a shell in a shady spot vs burrowing, slugs on the other hand do borrow frequently but lay eggs on ground level like snails, not the plant. Spiders make a round egg sacks away from high tragic areas covered in silk, or a cocoon. Aphids reproduce asexual via birthing clones normally and rarely do they lay eggs, when they do, they don't look like that and you would see aphids first before their eggs. Pluck em off and place in another area if you curious to see what hatches or toss em out. Good Luck!