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The adult female is sedentary and covered by an ovoid, green scale, about 3.5 mm long and only slightly...

Cover for Cucurbit yellow stunting disorder virus

Since the late 1970s, cucumbers and melons grown in 16,000 ha of polyethylene-covered glasshouses in south-east Spain have been seriously...


B; japonicus is an annual grass, originating in Eurasia and Northern Africa, which is introduced and invasive in rangelands in...

Cover for Bromus tectorum (downy brome)

B. tectorum has tremendous phenotypic plasticity, with self fertilization permitting continuous replication of successful genotypes, and occasional...

Cover for Hypogeococcus pungens (cactus mealybug)

The mealybug Hypogeococcus pungens is native to South America. It was first used as a biological control agent of invasive...

Cover for Brevicoryne brassicae (cabbage aphid)

Crops which can suffer severe attack by B. brassicae include cabbage, cauliflower, broccoli, radish, swede and mustard. Kale,...


The disease has recently been considered of particular importance in the USA, where cucurbit crops such as melons are grown under highly controlled...


C. cardunculus is an erect perennial herb, commonly known as cardoon or artichoke thistle. Native to southern Europe and North...

Cover for Cochliobolus lunatus (head mould of grasses, rice and sorghum)

C. lunatus is part of a complex of fungi, including Fusarium moniliforme and Phoma sorghina, and some other fungi that produce grain mould of...

Cover for Golovinomyces cichoracearum (powdery mildew)

In a survey in 1989, powdery mildew was found in 25% of sunflower fields in California, USA (Gulya et al., 1991). A high frequency (70-100%) of G....

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