Update: Checking for infestation on fruits and vegetables

Rav Shmuel Felder of Lakewood BMG does not rely on any of the commercial Hashgochas for infestation issues. 

Rav Felder only eats vegetables and fruit that was checked by his wife. Therefore she has many years of hands on experience. 

Check with her what works best, each leaf, Shmatah bedikah, both, etc.?

One of the most reliable proven methods for checking for infestation in fruits and vegetables is the Shmatah Bedikah or thrip cloth method. One washes the fruits or vegetables and pours the water through a fine mesh cloth, and then they check the cloth over a lightbox for any evidence of insects. If one is not trained in identifying insects, merely using the Shmatah Bedikah is of no value as a surgeon having a fully equipped operating room but not experience in the surgery.

The method described involves washing fruits or vegetables, filtering the wash water through a fine mesh cloth, and then examining the cloth over a lightbox for the presence of insects. This method seems very practical and helpful in examining and detecting small insects that might not be easily seen on the fruit or vegetable.

Using a light box, the insects caught in the cloth become more visible because of the contrasting background. This would make it easier to see tiny insects like thrips that might otherwise be hard to notice.

As pointed out, knowledge and training about insects that might infest fruits and vegetables is essential. Otherwise, one might not recognize an infestation even if it's on the cloth.

It's also worth noting that this method might only catch some infestations. Some insects could still be present in the fruit or vegetable but not be dislodged by washing so they wouldn't be caught in the cloth. Therefore, while this method can help detect specific infestations, more is needed for all situations or pests.

As with any method of pest detection or control, it's always a good idea to consult with professionals or experts in the field for advice specific to your situation and your local area. They can provide information about common pests, effective detection methods, and strategies for prevention and control.