Rose and Insects – Healthy Rose
Roses are attacked by various pests and diseases . To fight them , it is important to be able to place them and have intercourse what action to take .
Regular spray with a chemic compound is significant . Fortunately , most sprays that are used today can be mixed together and can thus be used at the same time , together , if desired , with a foliar feed .
There are several different type of sprayers useable , but because of their bargain rate and legerity , the pressurized credit card kinds are utilitarian . For ease of handling , do not buy too magnanimous a one . Although it might have to be filled several multiplication , a 2 pt . size of it is adequate for up to 150 plants .
Pests
These can be divide into two class , viz . ,sap - suckers , which let in aphid and red spider mite , andleaf - and - budeaters , such as caterpillar and sawfly .
now there are two types of insecticide : systemic insecticides , which enter the sap by preoccupancy through the leafage and are used against the muggins - sucking insects , andcontact insecticides , which destroy leaf and bud eaters by direct contact with them . Systemics are of no value against the latter because they do not absorb sufficient tomfool to poison them .
The systemics are effective for about one calendar month after spraying , whereas the contact type must be practice whenever the insects come along . A number of proprietary insecticides are mixtures of both .
Do not spray too before long , because the larvae of ladybugs hover flies , lace - wing - fly front , and braconid wasps , which are the natural enemies of aphids , appear at about the same clip as the caterpillars . It is expert to hand find fault and destroy them rather than spray them .
So that gardeners can detect unfriendly pests and diseases , their reading are pay below .
PESTS:
Sap - Suckers APHIDS
These small insects breed rapidly and soon engulf the rose trees ; they are sometimes pink , red or brown in people of color . By sucking the sap , they quash the vigor of the plant , lame the shoots and warp the leave , which ultimately fall prematurely .
They must be dealt with efficiently because not only do they damage the roses , they also ooze out a sweet , sticky fluid , honeydew , the natural food of the fungus , sooty mold , which by surface the leaves , interfere with their normal functioning . In addition , they are carriers of virus disease .
THRIPS
These small smuggled or brown insect sometimes swarm all over roses , particularly in thundery weather . Their immature form which are colored pale pink to reddish , suck the sap . If they are present , leaves become mottle in visual aspect , immature shoots are malformed and affected buds produce damaged blooms .
RED SPIDER tinge
These plague attack outdoor as well as greenhouse roses . They are very minute , red-faced insects , that are so firm that they may be mistaken for specks of dust . Their front is testify by the development of a okay , silken web under the leaves , in which they be and breed . The leave of absence of infected roses become mottled and off - coloring material . If bad attacked , they turn yellow and fall . There is also loss of vigor .
Leaf and Bud-Eating Insects
CATERPILLARS
These , the larva of moths and butterfly , manifest themselves in various ways , which admit holes in the leaf , skeletonizing of the leaf , rolling of the leaves and injured buds . Sometimes they exude a muggy fluid .
LEAF ROLLING SAWFLIESdeposit their orchis on the leaves cause them to undulate at the edges and hang down .
ROSE SLUG
The larvae ( grubs ) of these insects usually devour the upper side of leaves and skeletonize them .
DISEASES
The chief disease of roses are due to parasitical kingdom Fungi , and do damage by stealing vital foods from their tissue .
BLACK SPOT
This disease is well - know to all rose agriculturist . Its attacks are at their bad in August and September . It is recognized by the appearance of contraband or colored chocolate-brown spot on the farewell , often ab initio the lower ace . They step by step increase in size and join together . The stay part of the affected leaf becomes yellow and finally falls off , leaving the plants marginal .
No garden rosiness are resistant from attack from this disease , but there are some that are less susceptible . Hitherto fungicides used against black spot have been contact types , which form a protective pelage , which must be renewed at interval of a hebdomad or so , with more frequent applications in wet weather . None of the chemical compound recommended is a complete cure . of late the first systemic fungicide has been introduced . It is claimed to be effective against both black speckle and mildew .
MILDEW
This starts with livid or greyish - white spots on the young leave and finally pass around all over the plants , arrive at them look as if they have been dust with flour . The leaf become misshapen . Dryness at the roots often makes plants susceptible to mildew . Thus by keeping roses well - water , the relative incidence of the disease can be cut back .
as luck would have it , there come out to be a few garden roses that are very highly resistant to aggress . These are listed on the rightfield .
RUST
This has three characteristics : it only seems to round roses in certain areas in this nation , it often remains for two years or so and then disappear , and its spore require to be suspend to bourgeon and aggress the following class . The last two might be tie because a mild wintertime might prevent freezing . The disease appear in outpouring as rust - colored prominence on the back of the farewell . In June , orange - tinge spore develop . These germinate and the infection is widely spread . Later in August , they turn black and in this variety , they go over the winter .
DIEBACK AND CANKER
A stem turn on a rose will often change state chocolate-brown and die . This can be the outcome of several different things , including frost price , want of pee , careless pruning , causing jagged edges or being cut too gamy above a bud , the snapping of indurate shoots by high wind or rough handling , and by a fungus disease . The latter is straight dieback ; when the effect arises out of any of the other causes , it is ordinarily , but erroneously called dieback .
Another fungus disease , radical canker , infect wounds , the cut terminal of stems after pruning , especially when blunt carver are used , and hibernating bud , which ultimately leads to browning and die back . The first signs are jaundiced or cherry blemish or streaked , pimply or water - saturate share of the stem . The chocolate-brown area finally extends some inch down the bow , normally terminating in a reddish - brown moulding where it abuts healthy tissues . Whatever may be the cause , the only cure is to prune an affected shank back to a healthy bud or issue it out altogether , if it has reach out to the labor union , otherwise the tree diagram might die .
CHLOROSIS
This is not a rightful disease , but an ailment , chiefly because of a deficiency of iron and manganese . This can come about as far as the plant is concerned in the dirt in which there are ample quantities of these elements present , but where they are in a shape in which they can not be used by the rose , as often happens on alkaline filth . The symptom are yellowing of the parting and stems in spring . They often finally shrivel up and cast off off . Also , growth is stunted .
This condition can not be remedied by distributing average , simple compound of iron or atomic number 25 . If it is serious , the soil must be watered in spring with a proprietary conceptualization which hold in chelates of branding iron and manganese in a configuration that can be absorbed by blush wine , together with combat-ready magnesium , which is another vital plant food .
A pick of Roses that are More resistive to Fungus disease :
HYBRID TEA ROSESBrandenburg , Color Wonder , Duke ofWindsor , Colorama , Eden Rose , John S.Armstrong , Isobel de Ortiz , Peace , PinkFavorite , Rose Gaujard , Silver Lining , Wendy Cussons .
FLORIBUNDA ROSESAlliance , Arthur Bell , Chanelle , Elsie Devy , Elizabeth of Glamis , Mountain Haze , Masquerade , Orange Sensation , Pink Parfait , Queen Elizabeth , Scarlet Queen Elizabeth , Scented Air .
