The four main systemic pesticides used on food crops are members of the nitroguanidine/neonicotinoid group of chemicals, which has been implicated in the mysterious calmly clips disorder that his killed billions of bees.
Bee deaths attributed to CCD
Imidacloprid - these can be applied to many vegetables right up to the day there harvested
Thiamethoxam - first approved as a seed treatment for corn in 2002,these products have been applied to the soil since they were approved
Clothianidin - it is used as a seed treatment for canola, cereals, corn, and sugar beets as well as a soil treatment for potatoes.
Dinotefuran- this can be applied to the soil or sprayed on leafy greens, potatoes in the cucumber family.
When the pesticide action network reviewed the results of pesticide residue tests conducted by the US Department of Agriculture from 1999 to 2007, numerous samples contained residues of the systemic pesticides. For example, 74% of conventionally grown lettuce and 70% of broccoli samples showed Imidacloprid residues.
Clothianidin - was found on potatoes,Thiamethoxam showed up and strawberries and sweet peppers, and some collard green samples were laced with Dinotefuran
The US Environmental Protection Agency has launched comprehensive review of the environmental safety of The environmental safety of imidacloprid. The California department of pesticide regulation cited reports of eucalyptus nectar and pollen with imidacloprid levels up to 550 ppb. That's nearly 3 times 185 ppb needed to kill honeybees. The deadly levels of the systemic poisons are even showing up in the leaf guttation drops, those are water droplets that plants sometimes exude. The journal of economic entomology reports "when bees consume guttation drops, collected from plants grown with systemic pesticide coated seeds, they encounter death within a few minutes.
Equally disturbing, it appears that nitroguanidine pesticides can persistent in soil for 500 days or more, which creates a high risk scenario. After 1 or 2 applications, plants grown in treated soil may produce toxic pollen nectar, or guttation droplets for more than two seasons. All the while ,the entire treated area will be moderately toxic to beneficial earthworms Carabid Beatles, lady beetles, predatory pirate bugs, and more.
there is no scientific evidence yet that says food laced with these will harm humans, but why is the EPA allowing systemic pesticides on food plants in the first place? Do people really want to eat pumpkins that are so full of poisons they kill every cucumber beetles that dares take a bite? Looking beyond food plants, does the use of systemic pesticides to grow perfect roses justify the death of millions and possibly billions of bees and other insects? We need to set things right and learn this important lesson: When we let a novel, man-made chemicals loose in the food chain, we can't be entirely certain of what will happen next. This new contamination of our food is yet another reason to grow and buy organic.