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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:59.6964021Z
<P>Photo 4. General view of yam rust of undetermined species, Papua New Guinea.</P> <P>Photo 3. Yam rust of undetermined species from Papua New Guinea, showing typical rust symptoms on upper and lower leaf surfaces.</P> <P>Photo 2. Yam rust, <EM>Goplana australis</EM> (underside of 
leaf). 
</P> <P>Photo 1. Yam rust, 
<EM>Goplana dioscoreae</EM>, (upper leaf surface).</P>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Narrow distribution. Southeast Asia, Oceania. Only on yams. There are two types which are very similar. Minor diseases.
  • The two diseases occur late, and are unlikely to affect …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:57.9626564Z
<P>Diagram. Life cycle of <EM>Pratylenchus </EM><EM>coffeae</EM>.</P> <P>Photo 6. "Toppling" is a common symptom on banana when roots are attacked by <EM>Pratylenchus </EM><EM>coffeae</EM>. Note this banana has fallen over before the fruits have matured; a sign of nematode attack.&nbsp;A similar symptom occurs when bananas are infected by&nbsp;the nematode <EM>Radopholus similis</EM>.</P> <P>Photo 5. Banana roots with purple/black discolouration caused by <EM>Pratylenchus </EM><EM>coffeae</EM>. Infected roots rot and plants are weak and yields are small.</P> <P>Photo 4. <EM>Pratylenchus coffeae</EM>&nbsp;inside a root.</P> <p>Photo 3. The head of <EM>Pratylenchus</EM>&nbsp;sp. showing the hollow spear or stylet (arrow), which is used to puncture cells in order to move through the roots,&nbsp;as well as&nbsp;to feed on their contents.</p> <P>Photo 2. <EM>Pratylenchus </EM><EM>coffeae</EM>&nbsp;in yam causes a shallow rot beneath the skin.</P> <P>Photo 1. <EM>Pratylenchus </EM><EM>coffeae </EM>in yam causes a shallow rot beneath the skin; the importance of the rot is not only&nbsp;the loss of flesh for eating, it is also the loss of planting material. Yams infected with dry rot do not sprout or, if they do, the cutting will be infested with nematodes which will attack the roots when the sets are planted.</P>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. On yam, banana, and many other crops and weeds. Note, the burrowing nematode, Radopholus similis, causes a similar disease on banana (see Fact Sheet no. …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:57.4998233Z
<p>Photo 3. Yam leaf spots, <EM>Guignardia dioscorea, </EM><A>on</A><EM>&nbsp;Dioscorea pentaphylla</EM>.</p> <p>Photo 2. Yam leaf spots of <EM>Guignardia dioscoreae </EM>on <EM>Dioscorea esculenta, </EM>tan with&nbsp;darker margins.</p> <p>Photo 1. Leaf spots caused by <EM>Guignardia dioscoreae </EM>on mature leaves of <EM>Dioscorea esculenta.</EM></p>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Widespread distribution. On all yam species, but most common on Asiatic yam (or lesser yam), Dioscorea esculenta. A minor disease, unlikely to affect yield.
  • Leaf spots, circular or …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:56.6871184Z
<P>Photo 3. Leaves blacken rapidly&nbsp;after lengthy periods of rain followed by sunny days. Blackening occurs on the leaves and also on the stems in response to spores of <EM>Colletotrichum gloeosporioides</EM>. The spores germinate but do not infect.</P> <P>Photo 2.&nbsp;Only leaf veins of some yam varieties are infected by <EM>Colletotrichum gloeosporioides</EM>, and this happens when the leaves are young. As the leaves expand the damage causes them to become boat-shaped.</P> <P>Photo 1. Leaf spots of <EM>Colletotrichum gloeosporioides </EM>with typical yellow margins (haloes), expanding, and in some cases developing into a severe blight resulting in early death of the leaves.</P>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. There are many strains of the fungus attacking crops and weeds. An important disease.
  • A wet weather fungus mainly on greater yam. Spots on young leaves expand …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:55.3220980Z
<p>Photos 7. Seeds, winged false buttonweed, <EM>Spermacoce latifolia</EM>. Note, the deep cavity on one side of the seed (labelled by USDA APHIS PPQ as <EM>Spermacoce alata</EM>).</p> <p>Photo 6. Close-up of flower, winged false buttonweed, <EM>Spermacoce latifolia</EM>.</p> <p>Photo 5. Leaves and flowers&nbsp;of winged false buttonweed, <EM>Spermacoce latifolia.</EM></p> <p>Photo 4. Winged stem (and flowers) of winged false buttonweed, <EM>Spermacoce latifolia</EM>.</p> <p>Photo 3. Winged false buttonweed, <EM>Spermacoce latifolia</EM>, among taro (Fiji).</p> <p>Photo 2. Winged false buttonweed, <EM>Spermacoce latifolia</EM>, among cassava (Fiji).</p> <p>Photo 1. Field of winged false buttonweed, <EM>Spermacoce latifolia </EM>(Palau).</p>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. In Australia, Fiji, French Polynesia, Samoa.
  • Aggressive, invasive weed of annual crops (maize, soybean, rice), plantations (sugarcane, rubber, tea), orchards, …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:51.3794626Z
<P>Diagram. Life cycle of western flower 
thrips, <EM>Frankliniella occidentalis</EM>.</P> <P>Photo 5. Adult of western flower thrips, 
<EM>Frankliniella occidentalis</EM>. Note the feathery 
wings.</P> <P>Photo 4. Nymph of western flower thrips, 
<EM>Fankliniella occidentalis</EM>.</P> <P>Photo 3. Mottling on tomato fruits caused by 
<EM>Tomato spotted wilt virus</EM> transmitted by the western flower thrips, 
<EM>Frankliniella occidentalis</EM>.</P>
<P></P>. <P>Photo 2.&nbsp;Spotting on poinsettia leavers caused by western flower thrips, <EM>Frankliniella occidentalis</EM>.</P> <P>Photo 1. Spotting on tomato leavers caused by western flower thrips, <EM>Frankliniella occidentalis</EM>.</P>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. On more than 250 plants in 65 families; these include: soft fruit (plums, peaches, strawberries, grapes); flowers (Gladiolus, Impatiens, Gerbera, Chrysanthemum, …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:49.9107083Z
   7
Wedelia (447)
<p>Photo 7. Close-up, flowerhead, wedelia, <EM>Sphagneticola trilobata. </EM>Note, there are two groups of flowers; the outer ones have yellow petal-like leaves. Those at the centre do not.</p> <p>Photo 6. Close-up, flower of wedelia, <EM>Sphagneticola trilobata. </EM></p> <p>Photo 5. Leaves and flowers of wedelia, <EM>Sphagneticola trilobata. </EM></p> <p>Photo 4. Wedelia, <EM>Sphagneticola trilobata</EM>, close-up of Photo 2, aside of the road, south coast, Viti Levu, Fiji.&nbsp;</p> <p>Photo 3. Wedelia, <EM>Sphagneticola trilobata</EM>, side of the road, south coast, Viti Levu, Fiji.&nbsp;</p> <p>Photo 2. Large expanse of wedelia, <EM>Sphagneticola trilobata. </EM></p> <p>Photo 1. Large expanse of wedelia, <EM>Sphagneticola trilobata. </EM></p>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Widespread. Africa, Asia, North, South and Central America, Caribbean, Europe, Oceania. In most Pacific islands.
  • Important invasive, creeping, perennial weed of forests, forest …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:47.3287095Z
<p>Photo 6. Single plant, water lettuce, <EM>Pistia stratiotes</EM>, showing the feathery roots.</p> <p>Photo 5. Close-up flower, water lettuce, <EM>Pistia stratiotes.</EM></p> <p>Photo 4. Flower, water lettuce, <EM>Pistia stratiotes.</EM></p> <p>Photo 3. Close-up of leaves of water lettuce, <EM>Pistia stratiotes</EM>, showing the rosette formation and the characteristic pattern of the veins.</p> <p>Photo 2. Small colony of water lettuce, <EM>Pistia stratiotes.</EM></p> <p>Photo 1. Irrigation canal choked with water lettuce, <EM>Pistia stratiotes.</EM></p>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Widespread. Asia, Africa, North, South and Central America, Caribbean, Europe, Oceania. In many Pacific islands. 
  • Invasive free-floating freshwater weed. Major weed of lakes, …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:45.5427290Z
<p>Photo 9. Close-up of flower, water hyacinth, <EM>Eichhornia crassipes</EM>.</p> <p>Photo 8. Close-up of flower, water hyacinth, <EM>Eichhornia crassipes</EM>.</p> <p>Photo 7. Flower of water hyacinth, <EM>Eichhornia crassipes</EM>.</p> <p>Photo 6. Flower, long slender leaf stalks, and round leaf blades, water hyacinth, <EM>Eichhornia crassipes</EM>.</p> <p>Photo 5. Rosette of rounded leaves with swollen leaf stalks, water hyacinth, <EM>Eichhornia crassipes</EM>.</p> <p>Photo 4. Short stem, on top or just under water, linking mother and daughter plants,&nbsp;water hyacinth, <EM>Eichhornia crassipes</EM>.</p> <p>Photo 3. Typical mass of water hyacinth, <EM>Eichhornia crassipes</EM>, at edge of fast flowing river.</p> <p>Photo 2. Dense mass of water hyacinth, <EM>Eichhornia crassipes</EM>, some in flower (lilac-blue).</p> <p>Photo 1. Dense mass of water hyacinth, <EM>Eichhornia crassipes</EM>.</p>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Widespread. Asia, Africa, North, South and Central America, Caribbean, Oceania. In many Pacific islands.
  • Invasive weed of slow-flowing water: rivers, swamps, ponds, lakes, dams, …
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Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:17:42.9631515Z
<p>Photo 4. Ringspots of&nbsp;<EM>Papaya ringspot virus-W</EM>, on dark-skinned variety<EM>.</EM></p> <p>Photo 3. Close-up of Photo 2 to show detail of ringspots, <EM>Papaya ringspot virus-W.</EM></p> <p>Photo 2. <EM>Papaya ringspot virus-W</EM> on watermelon (Fiji), showing characteristic ring patterns.&nbsp;&nbsp;</p> <p>Photo 1.&nbsp;<EM>Papaya ringspot virus-W</EM> on watermelon (Tonga), showing characteristic ring patterns. &nbsp;</p>
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. In Oceania, Australia, Cook Islands, FSM, Fiji, French Polynesia, Nauru, New Caledonia, Northern Mariana Islands, Tokelau, Tonga, Vanuatu. A virus of crops in the …
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