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Pests of Orchards California red scale Grape vine moth Citrus leaf miner White louse scale Queensland fruit fly Phylloxera Anthracnose Lemon scab Melanose.

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Presentation on theme: "Pests of Orchards California red scale Grape vine moth Citrus leaf miner White louse scale Queensland fruit fly Phylloxera Anthracnose Lemon scab Melanose."— Presentation transcript:

1 Pests of Orchards California red scale Grape vine moth Citrus leaf miner White louse scale Queensland fruit fly Phylloxera Anthracnose Lemon scab Melanose Spined citrus bug Other problems deficiencies latkins2003

2 California red scale Order- Hemiptera ( hard) Appearance – The adult female cover circular, conical orange/red. The winged adult male cover is oval & grey. Crawlers & adults inject a toxic poison in saliva latkins2003

3 California red scale latkins2003 California red scale crawlers Adult male California red scale.

4 California red scale latkins2003  Damage- All of the above ground may be infested= Fruit blemishing, leaf yellowing, fall, twig & branch die back

5 California red scale latkins2003  Plants affected- Citrus,Acacias,Willows, Olives. Most widespread pest of citrus in NSW.  Conditions- Prefers dry inland or coastal, dust covering plants  Very troublesome pest

6 California scale Control Biological-Red & blue ladybird beetle larvae ( Chilocorus spp). The adult beetle lays her eggs under scale cover= larvae feed Aphytis melinus wasp lays her eggs under the scale cover of a second instar unmated female scale= hatched larvae feed, adult wasp also feed Cultural- Keep trees healthy, do not over fertilise / over- water, Control ants. They severely disrupt red scale parasites while tending red scale Avoid excessive dust build up on leaves and fruit, (eg from manure mulches, kaolin clays) latkins2003

7 Californian scale - Control latkins2003  Cultural - Fine, talc-sized particles of ash from bush fires can also disrupt biological control. Washing trees to remove dust or ash particles can help solve this problem.  Heavy fogs, drizzle, or rain can also help by either removing dust and ash particles or causing them to adhere to the leaf surface.  Chemical- White/pest oil ( not on blossom )

8 Citrus leaf miner Order- Lepidoptera Appearance –usually observed when leaves are damaged by larvae tunnels and pupal stage Damage-The larvae tunnel down new shoots near tips or junctions = wilting, distortion and obvious tunnelling Plants affected Citrus Common on coast and has a major impact inland on citrus orchard industry latkins2003

9 Citrus leaf miner - Damage latkins2003

10 Citrus leaf miner

11 latkins2003

12 Life cycle Damage occurs in later summer and autumn Larvae tunnel in surface layer of new leaves Pupal chamber is formed at the end of the larval stage where the larva wraps itself in a silk casing at the edge of the leaf. Adult lays eggs along leaf margin 0.3 mm in size 14 – 17 days complete lifecycle latkins2003

13 Control Winter fertilising to promote new growth in spring Prune off affected leaves and destroy Natural predators can control from 20 – 90% of all infestations White oil is the only recommended chemical control for home nurseries latkins2003

14 White Louse Scale latkins2003

15 White Louse Scale Generally found on trunk and lower branches first Spread to upper twigs and leaves Generally plant has branch die back and poor vigour Control is white oil treatment latkins2003



18 Queensland fruit fly Order- Appearance Damage Plants affected CONTROL latkins2003






24 Lemon scab latkins2003  FUNGUS  Appearance/ Damage-Irregular scabby areas on fruit, sometimes leaves & twigs. Wart-like outgrowths sometimes scabbed. Severe shedding of young fruit, external quality affected  Plants affected-Citrus ( mainly lemons & mandarins)

25 latkins2003

26  Spread- Rain, wind  Control- Occurs during damp weather & only on immature fruit, coastal areas. When symptoms seen it is too late to save infected fruit. Need for preventative spraying before next crop.  Chemical- Apply Bordeaux (+ white oil) in spring ant half petal fall and again in late Jan/early Feb at blossoming of second crop latkins2003

27 Melanose FUNGUS Appearance/ Damage-Small Reddish to dark brown spots on leaves & fruit. Streaky if spores are washed by rain, skin of fruit may become cracked and have a ‘mud- cake’ appearance Young leaves & fruit are susceptible & usually occurs on older trees in wet warm conditions latkins2003

28 Melanose Mudcake or sandpaper symptoms of melanose on grapefruit. latkins2003 Tearstaining caused by melanose spores washed down the fruit by dew or rain.

29 Melanose latkins2003  Plants affected-Citrus-Washington navels,Emperor mandarins & lemons  Spread- Water – dripping & splashing  Control- remove & destroy infected parts,Copper oxychloride + white oil at petal fall

30 Bronze Orange Bug Piercing and sucking mouthparts True bug Gregarious Damage the tips of new growth and cause leaf distorton Toxic urine from adults and older nymphs (eyes and hands, sensitive skin) latkins2003




34 BoB Control Hand removal shaking and spray with high pressure water Chemical use only white oil White oil affects most predators as well Affect new growth so prune damaged growth. latkins2003

35 Spined Citrus bug latkins2003

36 Summer fruit drop latkins2003 Citrus normally shed large numbers of fruitlets shortly after blossoming in the spring and at early fruit set (pea size). when warmer weather places stress on the tree. related to lack of water at, or soon after, fruit set. Root diseases and lack of nitrogen or trace elements may also be responsible..

37 Rind splitting Rind splitting of fruit, particularly in navels, also occurs before or near maturity as a result of climatic factors, specifically a drop in average temperatures and an increase in relative humidity at a time when the rate of fruit growth is decreasing. There is no control for the disorder.

38 Preharvest drop Preharvest drop in the autumn before fruit is fully mature is a common problem with navels and grapefruit. Some of this drop is natural, but in coastal areas fruit stung by Queensland fruit fly during the late autumn colour-change period is also very prone to drop. Some mandarin and lemon varieties will also shed fruit when damaged by the spined citrus bug. Brown spot infection in mandarins will result in fruit drop.spined citrus bug Brown spot

39 Alternate cropping (biennial bearing) Alternate cropping (biennial bearing) is a common problem with many citrus varieties, such as Valencia orange, Wheeny grapefruit, and mandarins. Pruning or thinning of the heavy crop and early harvesting will assist in reducing the problem.

40 Second crop fruit Sometimes orange trees will produce blossoms in the autumn after a stress period, and set a second crop. This fruit is often of poor quality (thick skins and low juice content) and is susceptible to fruit fly attack. With lemon trees, however, these intermediate crops are desirable

41 Grape vine moth latkins2003  Order- Lepidoptera  Appearance – Adult- black moth with yellow markings & tuffs of orange hair at the tip of the abdomen. Larva – blend of green, yellow, black with red markings at sides and a red band over body at hind end. Scattered white hairs over body.

42 Grape vine moth Damage- Larvae skeletonise leaves, defoliate to main stems Plants affected- Grapes, Fuchsias, Parthenocissus Prefers lush growth latkins2003

43 Grapevine moth control Biological- Dipel, birds, wasps predatory shield bug Oechalia schellenbergii. Natural predators are usually effective Physical- hand pick off from leaf dersides Chemical-Only spray in severe infestation latkins2003 Oechalia schellenbergii.

44 Grapevine moth control latkins2003 Larva being eaten by mating shieldbug

45 Phylloxera Order- Hemiptera Appearance –This aphid can live below or above ground & when swelling or galls are cut open aphids =green - yellow Damage- Roots- have fleshy yellow galls on the fine roots ( may be curved in a S shape).Leaves have fleshy yellowish irregular swellings. Infected plants are weak & do not produce good crops Plants affected- stressed grape vines (which are less able to repel their attack), in heavy soils & humid environments and warm temperatures. AN EXTREMELY SERIOUS PEST OF GRAPEVINES latkins2003

46 Phylloxera latkins2003

47 Phylloxera -Damage latkins2003 Root-feeding stages are the most damaging, causing a loss in plant vigour, wilting and leaf yellowing. Vines may eventually die within 3-10 years. The aphids live on the surface of root galls and inside the leaf galls.

48 Phylloxera -Damage latkins2003 Galls on infected leaves

49 Phylloxera -Damage The effect of phylloxera aphids feeding on the roots is to cause the vines to get progressively weaker, and they produce fewer leaves and grapes. latkins2003

50 Phylloxera control There is no chemical control & no economic means of removing it from the soil once it is established Cultural- QUARANTINE regulations, grow on resistant root stocks latkins2003

51 Anthracnose VARIOUS FUNGUS Appearance/ Damage- Small to large, dark circular spots or sunken lesions with raised rim on leaves, stems & fruit Can occur at any stage of growth, twig die back, corky spots on fruit, fruit drop & rot latkins2003

52 Anthracnose latkins2003 Stem and pods have black fruiting bodies, “acervuli,” with black hairs, “setae. Anthracnose leaf spot on watermelon leaf

53 Anthracnose characterised by discrete lesions that are usually found along leaf veins. In severe cases these lesions may run together and kill the entire leaf. Young leaves may become distorted as healthy tissue continues to grow around dead areas. latkins2003

54 Anthracnose latkins2003 Colletotrichum acutatum

55 Anthracnose Sunken lesions, slightly paler than the healthy tissue, are symptoms of tomato anthracnose. Black fruiting bodies are visible on this close-up of the lesion. latkins2003

56 Anthracnose Tomatoes develop sunken spots on ripe fruits, the central parts of which turn dark. latkins2003

57 Anthracnose latkins2003  Plants affected- Citrus, grapes, stonefruit, avocadoes etc  Spread- Water, wind, animals, tools, infected plants  Control- remove & destroy infected parts, crop rotation, disease free seed, improve drainage, air circulation, watering

58 Peach leaf curl latkins2003  Control- remove & destroy infected parts,Copper oxychloride before bud swell or late Winter

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