Effect of Different Control Methods on the Population of Sugarcane Whitefly ( Aleurolobus Barodensis Mask.)

i.e

tons per hectare in Khyber Pakhtunkhwa. The average recovery 9.79% is in Punjab, 10.55% in Sindh and 9.52% in Khyber Pakhtunkhwa and the national average is 10.02% (PSMA, 2018).
The sugarcane crop is invaded by several insect pests which cause major losses to the crop (Iqbal et al., 2012), and that may cause heavy loss in quality, these include; termites, borers, pyrilla, whitefly, bugs, mites etc., from these insects the whitefly is considered major threat on ratoon crops water logged soils, alkaline soils and soils with low manuring (Bhavani et al., 2013). Danialy, 1985 reported that the whitefly is a serious pest of sugarcane after borers and mite. Whitefly belongs to the family Aleyrodidae; presently 1556 species of whiteflies are published (Martin and Mound, 2007). Two species of whitefly are known to occur including Aleurolobus barodensis (Mask.) and Neomaskellia bergii (Sign.) (Masood, 2011). The losses due to heavy infestation reaches up to 86% and reduction in sugar recovery up to 1.4-1.8% are recorded. Traditionally for the control of whitefly several insecticidal recommendations have been reported in the past by various workers for the control of this pest at different places (Siddiqi and Saxena, 1960;Sandhu and Singh, 1964;Ananthanarayana et al., 1984).
The resistance among whitefly has been observed due to the extensive use of pesticides that ultimately causes imbalance of the environment and variety of unsolved health issues, also eradicate many of the natural enemies resulting in outbreak of secondary pests, interruption in eco-cycles and biodiversity which renders effective control even more difficult (Carruth and Moore, 1973;Sexena et al., 1992;Armes et al., 1992;Bellows, 2001). Human intervention for the goals of higher yields has created problems for biological control agents (Hodges and Evans, 2005). Therefore, there is an essential need to develop alternate, economic and environmental friendly methods to suppress population of sugarcane insect pests alone or combination with different control measures including host plant resistance, mechanical, cultural and biological. (Rachappa et al., 2000). The biological control is one of the most successful insect pests control (Pedigo, 2004). Zia et al. (2008) reported that due to application of predator Chrysoperlla carnea, observed maximum reduction of whitefly population (57.3%) in August followed by September (57.14%). Vidya and Balaji (2000) conducted studied on to evaluate performance of Chrysoperlla carnea (Stephens) on 6 insect pests of sugarcane and found very good predation on final instars of whitefly nymphs.
Due to high demands towards better control measures of sugarcane whitefly, present studies were designed to carry out in order to provide better strategies with minimum losses to the environment.

Materials and Methods
For the development of Integrated Pest Management strategies against whitefly, experiment was laid out during Feburary 2016 in Randomized Complete Block Design, with three replications at PARC-National Sugar and Tropical Horticulture Research Institute, Thatta, experimental field. The plot size was 50 m 2 along with 5 row of each variety having 10 meter in length and 1-meter row to row distance. The experiment comprised of twelve treatments including check is as under. The data were recorded from June to December at fortnight interval. The observations were collected from 10 plants of middle rows, from each plant fourth leaf was selected for the record of total number of nymphs and puparia, from the 4 cm 2 upper, middle and lower portion of each leaf and then converted into cm 2 per leaf. The data were analyzed statistically by using M-stat 8.1 software with the help of an IBM Compatible computer.

Cane yield
Cane Yield data tons ha -1 was recorded from each plot at the time of harvest for comparison of treatments.

Analysis of juice qualities parameters
At maturity of crop, five canes were randomly selected from the bulk produce in each replication. The canes samples were crushed into a cutter grinder, (SCF-L4, Smith Crafts Fabricator, Pakistan) to obtain homogeneous mass for sub-sampling. A 1000 gram of sub sample is pressed for five minutes at 250 bars (3625 psig) with a hydraulic press (SCF-HP-06 Smith Crafts Fabricator, Pakistan). The press separates the sub-sample into the juice portion and bagase portion after juice extraction. The extracted juice and the bagase were used to analyze separately for different quality parameters i.e., Fiber%, Brix%, Pol% and also purity% and CCS%.

Results and Discussion
The study on different varietal characters as well as an effect of whitefly infestation in sugarcane crop categorically described as under.

Whitefly population
Result presented in the Table 1 showed that all the treatments significantly reduced the whitefly population over control. The lowest number of whitefly population (0.38 nymphs + puparia per cm 2 per leaf ) with highest % mortality of whitefly (79.89%) was recorded in T11 where De-trash the infested leaves followed by Release of Chrysoperlla carnea and application of pesticide (Fipronil 5SC) @ 1800 ml ha -1 through irrigation, followed by T10 in which recorded 0.48 nymphs + puparia per cm 2 per leaf with 74.60 % mortality in which de-trash the infested leaves followed by Release of Chrysoperlla carnea cards and applied yellow sticky traps was applied. Earlier researchers reported that detrashed of affected leaves help preventing spread of whitefly (Singh et al., 1956;Ananthanarayana et al., 1984).
The next best treatment was T7 (De-trash the infested leaves followed by application of pesticide (Fipronil 5SC) @ 1800 ml ha -1 through irrigation.) in which recorded 0.56 nymphs + puparia per cm 2 per leaf with 70.37% mortality, followed by T5 (De-trash the infested leaves and Release of Chrysoperlla carnea cards) in which recorded 0.59 nymphs + puparia per cm 2 per leaf with 63.49% mortality and T6 (Detrash the infested leaves and Yellow sticky traps) in which recorded 0.71 nymphs + puparia per cm 2 per leaf with 62.43% mortality. Bhavani and Rao (2013) reported that removal of infested leaves + spray of imidachloprid gives higher percent mortality of whitefly over control (  The satisfactory treatments were T2 (Release of Chrysoperlla carnea cards) which recorded 1.21 nymphs + puparia per cm 2 per leaf 35.98% mortality followed by T3 (Release of Chrysoperlla carnea cards) in which recorded 1.31 nymphs + puparia cm 2 per leaf with 30.69% mortality. Furthermore, the results indicated that the singly application of biological control and yellow sticky traps showed minimum reduction of whitefly population. However, combination of overall control methods proved significantly best control of whitefly population and increased cane yield.

Cane yield
The data regarding cane yield tons' ha -1 in different treatments is presented in Table 2 indicated that the maximum yield % increase over control was 19.98% in T11 followed by T10 (17.92%), T7 (16.97%), T5 (15.45%), T6 (14.95%), T9 (13.86%), T3 (13.00%), T8 (11.00%), T1 (10.04%), T2 (7%) and T3 (5.11%). Butani (1965) observed that due to attack of sugarcane whitefly in India cause 15-20% reduction in tonnage. Furthermore, it was observed a clear fluctuation trend in increase in cane yield in various treatments. The treatments T2 and T3 when applied singly resulted in minimum increase in yield. Similarly, in T7 (De-trashing of leaves and application of pesticide were applied in combination) also showed a tremendous in percent increase in cane yield. It was further observed that increase in highest cane yield was observed in T11, where all the treatments were applied in combination.

Effect of different treatments on sugarcane juice quality
The data regarding brix%, pol%, purity% and sugar recovery% are given in Table 3 and also showed that the effect of different treatments on brix%, pol%, purity% and sugar recovery%. The detail of results is as under.
The data regarding the effect of treatments on CCS % over control showed in Table 3

Conclusions and Recommendations
Based on result from this research, it was observed that application of cultural practices along with chemical followed by cultural with biological and cultural with yellow sticky traps is economically best for growers. Where, application of individual treatment of chemical and cultural gives satisfactory result as compare biological and yellow sticky traps. However, combination of overall control methods cultural, biological, yellow sticky traps and chemical when applied in combination proved significantly best control of whitefly and increased cane yield. The biological control is environmentally safe, but it is effect on pest is slowly, for the adaptation of biological control it's applied continuously.