The method is relatively cheap and simple. From what is known of Eloria [noyesi] it might be thought of as a ‘smart bomb’ with a very short range."...
"The moth is indigenous to Peru and is highly host-specific to the coca bush. There is no evidence of it feeding on other plants … Its use as a control agent could, therefore, be concealed."
I wonder what else has been going on in the use of tiny animals in warfare. I found this, at the History website: "Bugs of War: How Insects Have Been Weaponized Throughout History/For millennia, six-legged soldiers have been conscripted to torment enemies."
At the end of the 2nd century, the Roman emperor Septimius Severus was on his way to wresting control of Mesopotamia from the local monarchs.... As the Roman legions advanced on the desert stronghold of Hatra.... The defenders crafted earthenware bombshells loaded with scorpions.... As Severus’s men reached the walls of Hatra, scorpion bombs rained down....
More recently:
During the Vietnam War, the Viet Cong dug a network of underground tunnels allowing them to decide when and where to fight.... Feeling his way through a dank passage, [an American] “tunnel rat” might overlook a trip wire and have a load of scorpions rain down from a hidden cavity in the roof. The Viet Cong also conscripted the Asian giant honeybee.... Soldiers gingerly relocated colonies to trails used by the Americans and then attached a small, explosive charge.... For their part, the U.S. military funded a research program to devise an apparatus to spray the Vietnamese enemy with the alarm pheromone of bees, thereby converting the local insects into fierce allies.... But the “weapon” was never deployed....
AND: Wikipedia has an article, "Entomological warfare."
Entomological warfare (EW) is a type of biological warfare that uses insects to interrupt supply lines by damaging crops, or to directly harm enemy combatants and civilian populations. There have been several programs which have attempted to institute this methodology; however, there has been limited application of entomological warfare against military or civilian targets, Japan being the only state known to have verifiably implemented the method against another state, namely the Chinese during World War II. However, EW was used more widely in antiquity, in order to repel sieges or cause economic harm to states. Research into EW was conducted during both World War II and the Cold War by numerous states such as the Soviet Union, United States, Germany and Canada. There have also been suggestions that it could be implemented by non-state actors in a form of bioterrorism. Under the Biological and Toxic Weapons Convention of 1972, use of insects to administer agents or toxins for hostile purposes is deemed to be against international law.
A poster from 1942:


