Heterodera glycines: soybean cyst nematode
Heterodera schachtii: sugarbeet cyst nematode
Globodera virginiae: a round cyst nematode
Globodera rostochiensis: potato cyst nematode
Heterodera trifolii: clover cyst nematode
Globodera solanacearum: a round cyst nematode
Heterodera schachtii: sugarbeet cyst nematode.
Heterodera schachtii: sugarbeet cyst nematode
Heterodera schachtii: sugarbeet cyst nematode
Heterodera schachtii: sugarbeet cyst nematode
Heterodera schachtii: sugarbeet cyst nematode
Heterodera avenae: cereal cyst nematode
Heterodera glycines: soybean
Heterodera glycines: soybean cyst nematode
Globodera rostochiensis: potato cyst nematode
Heterodera trifolii: clover cyst nematode
Heterodera schachtii: sugarbeet cyst nematode.
Heterodera schachtii: sugarbeet cyst nematode.
Heterodera schachtii: sugarbeet cyst nematode.
Cyst nematode extraction: the Fenwick can.
Potato cyst nematodes
Pasteuria penetrans
Heterodera schachtii / Hirsutella rhossiliensis
Heterodera schachtii / Hirsutella rhossiliensis
Heterodera schachtii / Hirsutella rhossiliensis
Heterodera schachtii / Hirsutella rhossiliensis
Soybean root with cysts.
Sugarbeet roots with white females and cysts.
Color changes as cyst matures.
Pattern on cyst wall.
Cross section of clover root and nematode.
Cyst broken open revealing eggs and J2.
J2 hatching from egg. Photo by Bruce Jaffee.
Damage to sugarbeets
Damage to sugarbeets: wilting, reduced growth, weeds.
Sugarbeet: Chemical control; aldicarb (Temik) left, untreated plot right.
Cabbage: Chemical control, right; untreated, left.
Wheat; nematicide trials, Australia.
Soybeans: resistant and susceptible.
Crop rotation strategies
Potato: following resistant variety (rear); following susceptible variety (front). Netherlands.
Damage patch in clover. Netherlands.
Sugarbeets: heavy equipment for soil fumigation in fine textured soil. Imperial Valley, California.
Sugarbeets: heavy equipment for soil fumigation in fine textured soil. Imperial Valley, California. (Slide circa 1972; note unsafe worker exposure).
Idaho: Nematicide trial data, 1960s.
Cysts float to surface in upcurrect of water and are caught on a coarse-mesh sieve (60-mesh).
Processing field smaples for regulatory decisions regarding field usage. Netherlands.
Spore of bacterial antagonist adhering to cuticle of Heterodera glycines.
Spore of the fungus Hirsutella rhossiliensis adhering to anterior of J2.
Germ tube from spore of Hirsutella rhossiliensis adhering penetrates cuticle and epidermis of J2.
Hypha exploiting body of J2.
Hyphae bearing sticky spores on phialides emerge from nematode cadaver.
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Heterodera glycines: soybean cyst nematode
Soybean root with cysts.