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What does L1 stand for?

L1 stands for first-stage larvae

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As you become more familiar with this immature stage of the insect (as well as other stages) you will have more information needed to effectively eliminate fleas from your home and keep them from re-infesting the area. Flea prevention is cheaper and far less time consuming than ridding your home of thousands of hungry fleas. Larvae hatch from their eggs in as little time as 2 days and up to 14 days from the time they are laid by the adult female. Temperature and humidity play major roles in this timing. Temperatures between 80 and 90 degrees Fahrenheit and a relative humidity of 70% or higher gives optimum conditions for the emergence of the first stage or instar of larvae.
5 to 10 µm, which are sheathed and have nocturnal periodicity, except the South Pacific microfilariae which have the absence of marked periodicity. The microfilariae migrate into lymph and blood channels moving actively through lymph and blood. A mosquito ingests the microfilariae during a blood meal. After ingestion, the microfilariae lose their sheaths and some of them work their way through the wall of the proventriculus and cardiac portion of the mosquito's midgut and reach the thoracic muscles. There the microfilariae develop into first-stage larvae.
At present, the only practical method available for routine laboratory estimation of the proportions of the worm genera present in the living animal, is to identify the larvae that are found in fresh faeces (mostly lungworm larvae) or those that develop in faecal cultures (gastrointestinal nematodes). However, it is often only the experienced person who can identify the larvae with a high degree of accuracy and few such persons remain for training the inexperienced. For many of the nematode genera, distinguishing features such as the shape of the cranial extremity (the head) of the larva are practically indistinguishable to all but the practised eye. Measuring first-stage larvae.
The parasitic adult female worms lay eggs within the horse's stomach. The eggs are later excreted through the feces. The eggs hatch out within the faeces producing first stage larvae.